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BEGIN:VEVENT
SUMMARY:Hyperasymptotic approximation to the OPE
DTSTART;VALUE=DATE-TIME:20191009T070000Z
DTEND;VALUE=DATE-TIME:20191009T073500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-80@indico.fis.ucm.es
DESCRIPTION:Speakers: Antonio Pineda ()\nWe construct hyperasymptotic expa
nsions for the static potential and the pole mass. We then compare the the
oretical predictions with lattice data and the large $\\beta_0$ approximat
ion.\n\nhttps://indico.fis.ucm.es/event/3/contributions/80/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/80/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniela Doneva: Neutron stars in modified theories of gravity - m
odels\, astrophysical implications and gravitational wave emission (From
N*-Theory workshop)
DTSTART;VALUE=DATE-TIME:20191011T101000Z
DTEND;VALUE=DATE-TIME:20191011T104500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-121@indico.fis.ucm.es
DESCRIPTION:https://indico.fis.ucm.es/event/3/contributions/121/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/121/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Locality in the pseudo-Hermitian Quantum Field Theories
DTSTART;VALUE=DATE-TIME:20191008T105000Z
DTEND;VALUE=DATE-TIME:20191008T112500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-73@indico.fis.ucm.es
DESCRIPTION:Speakers: Oleg Novikov (Saint Petersburg State University)\nMa
ny non-Hermitian but PT-symmetric Hamiltonians produce the quantum evoluti
on that is unitary under the non-standard inner product. This allows us to
interpret them in the pseudo-Hermitian way and relate to the well-behaved
but very complicated quantum models through the non-unitary transformatio
n. However for the generic PT-symmetric quantum field theory this transfor
mation becomes non-local and causality issues arise. We explore possible w
ays to solve this problem.\n\nhttps://indico.fis.ucm.es/event/3/contributi
ons/73/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/73/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relativistic Quantum Meson Gas at Finite Temperature: Equilibrium\
, Nonequilibrium Initial States and Time Evolution and Dimensional Reducti
on (an Overview)
DTSTART;VALUE=DATE-TIME:20191007T153000Z
DTEND;VALUE=DATE-TIME:20191007T160500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-81@indico.fis.ucm.es
DESCRIPTION:Speakers: Ramon F. Alvarez-Estrada (UCM)\nA quantum gas of int
eracting relativistic effective massive mesons at finite temperature (eith
er at approximate thermal equilibrium or off-equilibrium)\, ressembling qu
alitatively those produced in a heavy-ion collision\, is described by a sc
alar renormalizable relativistic quantum field theory (RRQFT) with quartic
self-interaction\, in (1+3)-dimensional Minkowski space. \n A short dis
cussion of the gas at equilibrium\, in both imaginary and real time formal
isms\, is presented. Simplified descriptions of the equilibrium gas for hi
gh temperature and large spatial scales (equilibrium dimensional reduction
or EDR) in both formalisms are summarized. In so doing\, the well known (
and certainly useful) EDR for the imaginary-time formalism is extended to
the real-time one. \n Most of the talk will be devoted to the off-equilib
rium gas. A very short overview of existing approaches to the description
of the time evolution of the off-equilibrium gas by other authors will be
presented. \n A general initial nonequilibrium state AT FINITE TIME in RR
QFT gives rise to additional ultraviolet divergences\, which pose known (
and harder) conceptual difficulties. In spite of the above general difficu
lties\, for gases and plasmas described by effective RRQFT\, there do exi
st restricted ( still physically meaningful) classes of initial nonequili
brium states for which the time evolutions do not meet those conceptual di
fficulties. Then\, the time evolutions of the off-equilibrium gas can inde
ed be dealt with within the conceptual framework of perturbative renormal
ization\, up to certain (non-trivial) modifications. \n By assumption\, t
he initial state AT FINITE TIME of the gas of effective mesons\, not
far from thermal equilibrium\, belongs to the latter restricted class of
initial nonequilibrium states and includes interactions and inhomogeneitie
s. The gas at equilibrium in real-time formalism\, outlined above\, turns
out to provide a source of hints for the off-equilibrium analysis. The ti
me evolution of the off-equilibrium gas is described by means of nonequil
ibrium real-time generating functionals and correlators at non-zero temp
erature. \n Main result.- For high temperature and large temporal and sp
atial scales\, we justify that classical nonequilibrium statistical me
chanics ( including crucial renormalization effects\, remnants of the unde
rlying quentum theory) do describe \napproximately the gas: nonequilibrium
dimensional reduction (NEDR). In the NEDR regime\, our arguments yield: 1
) renormalized correlators do simplify\, 2) the perturbative series for t
hose simplified correlators can be resummed into a nonequilibrium generati
ng functional\, which is super-renormalizable and includes renormalization
effects (large position-dependent thermal self-energies and effective cou
plings). The latter super-renormalizable nonequilibrium generating functi
onal for the NEDR regime could enable to study nonperturbatively changes
in the phase structures of the field\, by proceeding from a general none
quilibrium quantum regime to the NEDR one. \n References: R. F. Alvarez-E
strada: 1) ``Initial States and Time Evolution in Nonequilibrium Quantum F
ield Theory''\, Nucl. Phys. A\, Vol. 785\, 218c (2007)\; 2) Nonequilibrium
Quantum Anharmonic Oscillator and Scalar Field: High Temperature Approxim
ations\, Ann. Phys. (Berlin)\, Vol. 18\, 391 (2009)\; 3) Nonequilibrium Qu
antum Meson Gas: Dimensional Reduction\, Eur. Phys. J. A\, Vol. 41\, 53 (
2009).\n\nhttps://indico.fis.ucm.es/event/3/contributions/81/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/81/
END:VEVENT
BEGIN:VEVENT
SUMMARY:X(3872) in relativistic heavy ion collisions
DTSTART;VALUE=DATE-TIME:20191007T122000Z
DTEND;VALUE=DATE-TIME:20191007T125500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-90@indico.fis.ucm.es
DESCRIPTION:Speakers: Volodymyr Magas (Universidad de Barcelona\, Spain)\n
Right since its discovery in 2003 by the Belle collaboration\, establishin
g the nature of the $X(3872)$ meson has been one of the main priorities in
the field of quarkonium physics. Not qualifying as a conventional $c\\bar
{c}$ state\, the multiquark structure of this exotic meson has received ve
ry different interpretations\, ranging from a compact tetraquark configura
tion to an extended $D\\bar D^*$ molecule. \n\nIn this work we explore th
e effect that a hot pion bath may have in the properties of the $X(3872)$\
, assuming this state to be a $D\\bar D^*$ molecule. We derive the finite
temperature effects on the $X(3872)$ from a coupled channels unitarized am
plitude\, obtained including the properties of the charmed mesons under s
uch conditions.\n\nWe find that the $X(3872)$ develops a substantial width
\, of the order of a few tens of MeV\, in hot pionic environments at tempe
ratures 100-150 MeV\, and its nominal mass moves above the $D D^*$ thresho
ld. The fact that the $X(3872)$ in a hot pion gas may no longer be a narr
ow resonance needs to be considered in the estimation of production yields
in relativistic heavy ion collisions.\n\nhttps://indico.fis.ucm.es/event/
3/contributions/90/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/90/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement and thermal behaviour of pp collisions
DTSTART;VALUE=DATE-TIME:20191008T074000Z
DTEND;VALUE=DATE-TIME:20191008T081500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-74@indico.fis.ucm.es
DESCRIPTION:Speakers: Carlos Pajares Vales (Universidad Santiago de Compos
tela)\nThe thermalization of particles produced in collisions of small sys
tems can be achieved by quantum entanglement of the partons of the initial
state. We study the transverse momentum distributions in pp and PbPb coll
isions at different energies and centralities\, observing in all cases a r
elation between the effective thermal temperature of the low pt spectrum a
nd the hard scale of the high pt spectrum. This relation is mainly due to
the normalized fluctuations of the number of partons. We show a relation b
etween these fluctuations and the temperature fluctuations by means of a L
angevin equation for a white stochastic noise. We compute the entanglement
entropy\, Using that the multiplicity distribution associated to events w
ith at least a hard collision is a gamma distribution. The leading contrib
ution is the logarithm of the number of partons\, meaning that these micro
states are equally probable and the entropy is maximal\n\nhttps://indico.f
is.ucm.es/event/3/contributions/74/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/74/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutrino Masses from the Point of View of Economy and Simplicity
DTSTART;VALUE=DATE-TIME:20191010T093000Z
DTEND;VALUE=DATE-TIME:20191010T100500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-78@indico.fis.ucm.es
DESCRIPTION:Speakers: Bilenky Samoil (JINR(Dubna))\nIn the framework of su
ch basic principles as local gauge invariance\, unification of the weak an
d electromagnetic interactions and spontaneous symmetry breaking in the St
andard Model the most economical and simplest possibilities are realized
. We discuss the problem of neutrino masses from the point of view of ec
onomy and simplicity. It is unlikely that neutrino masses are of the same
SM origin as masses of leptons and quarks. The Weinberg effective Lagrang
ian is the simplest and the most economical\, beyond the Standard Model me
chanism of the generation of small Majorana neutrino masses. The resoluti
on of the sterile neutrino anomaly and observation of the neutrinoless dou
ble $\\beta$-decay would be crucial tests of this mechanism.\n\nhttps://in
dico.fis.ucm.es/event/3/contributions/78/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/78/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cylindrically symmetric 2+1-dimensional gravity: quantization in t
erms of global phase space variables.
DTSTART;VALUE=DATE-TIME:20191010T130000Z
DTEND;VALUE=DATE-TIME:20191010T133500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-111@indico.fis.ucm.es
DESCRIPTION:Speakers: Alexander Andrianov (SPbSU)\nWe perform canonical an
alysis of a model in which gravity is coupled to a circular dust shell in
2+1 spacetime dimensions.\n The result is a reduced action depending on a
finite number of degrees of freedom.\nThe emphasis is made on finding cano
nical variables providing the global chart for the entire phase space of t
he model.\nIt turns out that all the distinct pieces of momentum space cou
ld be assembled into a single manifold which has $ADS^2$-geometry\, and th
e global chart for it is provided by the Euler angles.\nIn quantum kinemat
ics\, this results in non-commutativity in coordinate space and discretene
ss of the shell radius in timelike region\, which includes the collapse po
int.\nAt the level of quantum dynamics\, we find transition amplitudes bet
ween zero and non-zero eigenvalues of the shell radius\, which describe th
e rate of gravitational collapse (bounce). Their values are everywhere fin
ite\, which could be interpreted as resolution of the central singularity.
We also find the map between $ADS^2$ momentum space obtained here and mo
mentum space in Kuchar variables\, which could be helpful in extending the
present results to 3+1 dimensions.\n\nhttps://indico.fis.ucm.es/event/3/c
ontributions/111/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/111/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Long-range rapidity and angular azimuthal correlations in the mode
l with a string fusion
DTSTART;VALUE=DATE-TIME:20191007T145000Z
DTEND;VALUE=DATE-TIME:20191007T152500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-84@indico.fis.ucm.es
DESCRIPTION:Speakers: Vladimir Vechernin (St Petersburg State University (
RU))\nIn the framework of the model with quark-gluon strings considered as
color flux tubes we study the correlations between various observables in
two acceptance windows separated in rapidity and azimuth\, used in the an
alysis of the multiparticle production in hadronic interactions at high en
ergy. To take into account the string fusion effects leading to a formatio
n of string clusters with new properties we introduce in the model the fin
ite lattice (grid) in the transverse (impact parameter) plane. \nIn the fr
amework of this approach\, for a realistic case with an inhomogeneous dist
ribution of strings in the transverse plane\, we find explicit analytical
formulas for the asymptotes of the coefficients of the long-range rapidity
correlations between various quantities\, including intense (the mean tra
nsverse momentum) at large string density. \nWe study also a strongly inte
nse variable between the multiplicities of particles produced in two obser
vation windows separated in rapidity and azimuth. We show that in the case
of independent identical strings\, this observable is indeed a strongly i
ntense quantity. It depends only on the string characteristics and does no
t depend on the trivial\, so-called "volume" fluctuations in the number of
strings\, arising\, in particular\, from inevitable impact parameter fluc
tuations. When taking into account the formation of string clusters with n
ew properties\, this variable becomes equal to the weighted average of its
values for different clusters. The weights depend on the conditions of th
e collision\, and the variable loses its strongly intensive property. \nWe
analyze the properties of the obtained correlation coefficients and the s
trongly intensive variable under study\, and also the possibilities of its
experimental observation.\nWe also show that long-range azimuthal-rapidit
y correlations (the ridge) can arise from the superposition of many events
with exchange of cluster of different number of strings and not from two-
particle correlations in a single event. In this case it appears in the re
sulting two-particle correlation function due to the event-by-event fluctu
ation of the azimuthal distribution. The physical reason\, which leads to
the event anisotropy of the azimuthal distribution in this approach\, is t
he final state interaction of produced particles with the fused string med
ium.\nThe presentation is based on the papers [1-5]. \n\nThe research was
supported by the Russian Foundation for Basic Research grant (No. 18-02-40
075) and the St. Petersburg State University grant (Id: 43319394).\n\n1. S
.N. Belokurova\, V.V. Vechernin\, Strongly intensive variables and long-ra
nge correlations in the model with a lattice in the transverse plane\, \nT
heor. Math. Phys. 200 (2019) 1094–1109 [to be appear in the August issue
]\n2. E. Andronov\, V. Vechernin\, Strongly intensive observable between m
ultiplicities in two acceptance windows in a string model\,\nEur. Phys. J.
A 55 (2019) 14_1-12.\n3. V. Vechernin\, Short- and long-range rapidity co
rrelations in the model with a lattice in transverse plane\, \nEPJ Web Con
f. 191 (2018) 04011_1-8.\n4. M.A. Braun\, C. Pajares and V.V. Vechernin\,
Ridge from strings\, \nEur. Phys. J. A 51 (2015) 44_1-11.\n5. V.V. Vechern
in\, Forward-backward correlations between multiplicities in windows separ
ated in azimuth and rapidity\,\nNucl. Phys. A 939 (2015) 21-45.\n\nhttps:/
/indico.fis.ucm.es/event/3/contributions/84/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/84/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Influence of the QCD critical point on the nucleon-nucleon potenti
al and nuclear correlations
DTSTART;VALUE=DATE-TIME:20191008T082000Z
DTEND;VALUE=DATE-TIME:20191008T085500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-87@indico.fis.ucm.es
DESCRIPTION:Speakers: Juan Torres-Rincon (Goethe University Frankfurt)\nTh
e scalar-isoscalar mode of QCD is expected to become very light close to t
he second-order chiral critical point. This mode is the main responsible f
or the attractive part of the nucleon-nucleon potential at distances of 1-
2 fm. Therefore\, a strong long-range attraction among nucleons is predict
ed to develop close to the QCD critical point. Using the Walecka-Serot mod
el for the NN interaction we study the effects of the critical mode in a s
ystem of nucleons and mesons using a molecular dynamics code\, complemente
d by a Langevin dynamics for the freeze-out conditions of heavy-ion collis
ions. Working beyond mean-field level\, we observe strong nucleon correlat
ions which might lead to baryon clustering. We propose that light-nuclei f
ormation\, together with an enhancement of the proton distribution cumulan
ts can signal the presence of the QCD critical point.\n\nhttps://indico.fi
s.ucm.es/event/3/contributions/87/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/87/
END:VEVENT
BEGIN:VEVENT
SUMMARY:RG Equations and High Energy Behaviour in Non-Renormalizable Theo
ries
DTSTART;VALUE=DATE-TIME:20191009T085000Z
DTEND;VALUE=DATE-TIME:20191009T092500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-83@indico.fis.ucm.es
DESCRIPTION:Speakers: Dmitry Kazakov (JINR)\nWe suggest a novel view on no
n-renormalizable interactions. It is based on the usual BPHZ R-operation
which is equally applicable to any local QFT independently of whether it
is renormalizable or not. As a playground we take the \\phi^4_D theory i
n D dimensions for D=4\,6\,8\,10 and consider the four-point scattering am
plitude on shell. We derive the generalized RG equation and find the solut
ion valid for any $D$ that sums up the leading logarithms in all orders o
f PT in full analogy with the renormalizable case. It is found that the
scattering amplitude in the \\phi^4_D theory possesses the Landau pole a
t high energy for any D. We discuss the application of the proposed proce
dure to other non-renormalizable theories.\n\nhttps://indico.fis.ucm.es/ev
ent/3/contributions/83/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/83/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutrino oscillations in gravitational waves
DTSTART;VALUE=DATE-TIME:20191010T101000Z
DTEND;VALUE=DATE-TIME:20191010T104500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-85@indico.fis.ucm.es
DESCRIPTION:Speakers: Maxim Dvornikov (Institute of Terrestrial Magnetism\
, Ionosphere and Radiowave Propagation)\nI study neutrino oscillations dri
ven by a plane gravitational wave. First\, I consider neutrino spin oscill
ations in this gravitational background. I derive the covariant equation f
or the neutrino spin evolution in a magnetic field and background matter i
n curved space-time. Then I discuss a particular situation when a neutrino
interacts with matter\, a transverse magnetic field and a gravitational w
ave. I demonstrate that a parametric resonance can appear in this system.
Some astrophysical applications are discussed.\nThen I turn to the conside
ration of neutrino flavor oscillations in a gravitational wave. I derive t
he effective Hamiltonian for neutrino oscillations. Then I study the situa
tion when the stochastic gravitational waves background is present. The eq
uation for the density matrix evolution is derived and solved both analyti
cally (in the two flavors approximation) and numerically (for the general
case of three neutrino flavors). I predict a specific flavor content of lo
w energy neutrinos at a detector. Some applications for measurements of co
smic neutrinos are considered.\nReferences\n1. M. Dvornikov\, Neutrino spi
n oscillations in external fields in curved spacetime\, Phys. Rev. D 99\,
116021 (2019)\, arXiv:1902.11285.\n2. M. Dvornikov\, Neutrino flavor oscil
lations in stochastic gravitational waves\, arXiv:1906.06167.\n\nhttps://i
ndico.fis.ucm.es/event/3/contributions/85/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/85/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resumming the fermionic in-medium ladder diagrams to all orders
DTSTART;VALUE=DATE-TIME:20191011T072000Z
DTEND;VALUE=DATE-TIME:20191011T075500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-86@indico.fis.ucm.es
DESCRIPTION:Speakers: José Antonio Oller (Universidad de Murcia)\nIn the
past I derived from QFT the generating functional of Green functions in a
fermionic medium. Based on this many-body scheme I give an algebraic deriv
ation from first principles of the purely diagrammatical method introduced
by N. Kaiser [NPA860\,411(2011)] to resum the ladder diagrams for the cal
culation of the energy per particle in a fermionic environment\, including
only a constant interacting term in the Hamiltonian. A generalization of
this resummation for any given fermion-fermion scattering matrix in vacuum
results from the new derivation provided. I also discuss other outcomes o
f this resummation.\n\nhttps://indico.fis.ucm.es/event/3/contributions/86/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/86/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Influence of resonance decays on forward-backward correlations
DTSTART;VALUE=DATE-TIME:20191007T141000Z
DTEND;VALUE=DATE-TIME:20191007T144500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-91@indico.fis.ucm.es
DESCRIPTION:Speakers: Vladimir Kovalenko (St Petersburg State University (
RU))\nThe study of forward-backward correlations between observables from
separated rapidity intervals is considered as a sensitive tool for observi
ng the collective phenomena in the ultrarelativistic collisions of hadrons
and nuclei and for investigation of the initial stages of the hadronic in
teraction. The selection of a large gap between rapidity intervals facilit
ates the elimination of the short-range effects\, such as jets\, resonance
s decays\, and correlated quark-antiquark pairs arizing during string deca
y.\nIn order to study the behavior of the forward-backward multiplicity an
d transverse momentum correlations\, we calculated them in a Monte Carlo m
odel with formation and fusion of quark-gluon strings\, considering two op
tions: with and without the resonance production and decay\, provided that
the mean multiplicity per rapidity stays the same. We show that the decay
of the resonances causes the considerable modification of n-n and pt-pt c
orrelations compared to the case of purely prompt particle production.\nTh
e decays have a small effect on the shape of the centrality dependence of
the correlation coefficients in AA collisions but improve the agreement of
string fusion model prediction with the experimental data.\nThe research
was supported by the grant of the Russian Foundation for Basic Research (p
roject 18-32-01055 mol_a).\n\nhttps://indico.fis.ucm.es/event/3/contributi
ons/91/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/91/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Various definitions of heavy quarks masses in QCD and the structur
es of their perturbative relations through several resummations approach
es
DTSTART;VALUE=DATE-TIME:20191009T074000Z
DTEND;VALUE=DATE-TIME:20191009T081500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-92@indico.fis.ucm.es
DESCRIPTION:Speakers: Andrei Kataev (INR RAS )\nThe asymptotic structure o
f the perturbative relation between $\\bar{MS}$ and on-shell heavy quark m
asses is considered in QCD at the O(\\alpha_s^6) level. The flavour-depend
ence of the considered PT corrections is analysed. In higher orders this
dependence is estimated using three techniques\, namely the effective cha
rges motivated approach\, the encoded in the asymptotic formula infrared r
enormalon method and the large-β0 approximation based on the explicit cal
culations of the leading in powers of the number nl of massless flavors te
rms. The following from the large-β0 analysis sign-alternating structure
of the expanded in powers of nl estimated five- and six-loop corrections i
s studied in detail. It is demonstrated that application of the first and
third techniques leads to the required sign-alternation\, while the second
method in used by us approximation respects it only after additional impo
sed requirements.\n\nhttps://indico.fis.ucm.es/event/3/contributions/92/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/92/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative quantization of effective string
DTSTART;VALUE=DATE-TIME:20191010T145000Z
DTEND;VALUE=DATE-TIME:20191010T152500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-77@indico.fis.ucm.es
DESCRIPTION:Speakers: Yuri Makeenko (ITEP\, Moscow)\nI describe quantizati
on of bosonic string about the mean-field ground state\, which turns out t
o be stable in the target-space dimension 2 < d < 26 contrary to the usual
classical ground state which is stable only for d<2\, and discuss how thi
s resolves some old problems with strings. I compute the string susceptibi
lity index gamma_{str} in the mean-field approximation and demonstrate tha
t it differs from the standard results by KPZ-DDK. Using Pauli-Villars reg
ularization\, I compute a correction to the Liouville action by going beyo
nd the conformal anomaly and accounting for quadratic divergences and spec
ulate on how the associated conformal field theory may look like.\n\nhttps
://indico.fis.ucm.es/event/3/contributions/77/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/77/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analytic Infinite Derivative (AID) gravity
DTSTART;VALUE=DATE-TIME:20191010T134000Z
DTEND;VALUE=DATE-TIME:20191010T141500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-136@indico.fis.ucm.es
DESCRIPTION:Speakers: Alexey Koshelev (Univ. of Beira Interior)\nI will ex
plain how theories with analytic functions of derivatives are\nconnected t
o strings and in particular arise in string field theory\n(SFT) and will s
pent the most part of my talk on the good\nand unrevealed properties of an
alytic infinite derivative (AID) gravity.\nIn particular\, I will discuss
questions of avoiding singularities as\nwell as possible observational evi
dences for such a non-local\nmodification of Einstein’s theory. Namely\,
imprints in inflationary\nspectra including non-gaussianities. On top of
this I will raise several\npurely mathematical questions which need to be
solved in order to push\nthe physics developments further.\n\nhttps://indi
co.fis.ucm.es/event/3/contributions/136/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/136/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The light meson spectrum from QCD sum rules for linear radial traj
ectories
DTSTART;VALUE=DATE-TIME:20191007T114000Z
DTEND;VALUE=DATE-TIME:20191007T121500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-142@indico.fis.ucm.es
DESCRIPTION:Speakers: Sergei Afonin ()\nA scheme of calculation of large-N
c masses of light mesons from\nthe planar QCD sum rules is discussed. We w
ill present two methods based on the use of linear radial Regge trajectori
es with a special emphasis on the scalar sector.\n\nhttps://indico.fis.ucm
.es/event/3/contributions/142/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/142/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmic analogy in the search for new physics in pp collisions at t
he LHC
DTSTART;VALUE=DATE-TIME:20191010T070000Z
DTEND;VALUE=DATE-TIME:20191010T073500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-103@indico.fis.ucm.es
DESCRIPTION:Speakers: Miguel-Angel Sanchis-Lozano (IFIC-University of Val
encia)\nWe present an analogy between multiparticle production in proton-p
roton collisions at the LHC and the time evolution of the early universe.
In particular we focus on long-range angular correlations of the CMB on th
e one hand\, and particle emission in pp interactions on the other hand\,
pointing out suggestive connections between both physical cases. Moreover\
, we show how the analysis of angular correlations under the applications
of strict selection cuts events could uncover the presence of New Physics
(hidden/dark sectors) in hadronic collisions\, while providing a new insig
ht into the cosmological evolution of the universe.\n\nhttps://indico.fis.
ucm.es/event/3/contributions/103/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/103/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral perturbation theory vs. Linear σ model in a chiral imbalan
ce medium
DTSTART;VALUE=DATE-TIME:20191008T093000Z
DTEND;VALUE=DATE-TIME:20191008T100500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-98@indico.fis.ucm.es
DESCRIPTION:Speakers: Vladimir Andrianov (Saint Petersburg State Universit
y)\nWe compare Chiral Perturbation Theory (ChPT) and the Linear Sigma Mode
l\n(LSM) as realizations of low energy QCD for light mesons in a chirally
imbalanced\nmedium. The relations between the phenomenological low-energy
constants of the \nChiral Lagrangian and the corresponding constants of th
e Linear Sigma Model are \nestablished as well as the expressions for the
decay constant of the pi-meson in \nthe medium and the mass of the a_0 -me
son. In the large Nc count taken from \nQCD the correspondence of ChPT and
LSM is remarkably good and give a solid \nground for search of chiral imb
alance manifestation in pion physics. A possible \nexperimental detection
of chiral imbalance tracks (and therefore a phase with \nlocal parity brea
king) in the charged pion decays inside the fireball is outlined\n\nhttps:
//indico.fis.ucm.es/event/3/contributions/98/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/98/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Unitarity problems in higher derivative field theories and Quantum
Gravity
DTSTART;VALUE=DATE-TIME:20191009T093000Z
DTEND;VALUE=DATE-TIME:20191009T100500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-110@indico.fis.ucm.es
DESCRIPTION:Speakers: Manuel Asorey ()\nWe analyze the unitarity propertie
s of higher derivative quantum\nfield theories which are free of ghosts an
d ultraviolet singularities.\nWe point out that in spite of the absence of
ghosts most of these\ntheories are not unitary. This result confirms the
difficulties of\nfinding a consistent quantum field theory of quantum grav
ity.\n\nhttps://indico.fis.ucm.es/event/3/contributions/110/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/110/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic description of heavy ions collisions
DTSTART;VALUE=DATE-TIME:20191007T130000Z
DTEND;VALUE=DATE-TIME:20191007T133500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-137@indico.fis.ucm.es
DESCRIPTION:Speakers: Irina Aref'eva (Steklov Mathematical Institute)\nWe
consider holographic description of heavy ions collisions. The dependence
of total multiplicity on the energy forcing us to deal with anisotropic ho
lographic models. We derive the holographic renorm group flow (HRGF) equat
ions in the presentce of anisotropy and a non-zero chemical potential. We
show that in particular cases HRGFs reproduce the QCD RGFs. We consider th
e behaviour of the Wilson loops in the constructed backgrounds and find th
e form of the anisotropic QCD phase diagrams.\n\nhttps://indico.fis.ucm.es
/event/3/contributions/137/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/137/
END:VEVENT
BEGIN:VEVENT
SUMMARY:BFKL as QCD asymptotics at high energies
DTSTART;VALUE=DATE-TIME:20191008T151500Z
DTEND;VALUE=DATE-TIME:20191008T155000Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-143@indico.fis.ucm.es
DESCRIPTION:Speakers: Victor Kim (NRC KI - PNPI\, Gatchina & SPbPU\, St. P
etersburg)\nRecent BFKL evolution developments are briefly reviewed. BFKL
evolution manifestations at high energies are discussed.\n\nhttps://indico
.fis.ucm.es/event/3/contributions/143/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/143/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitation wave driven CFS instability of neutron stars and curre
nt observational constraints
DTSTART;VALUE=DATE-TIME:20191011T084000Z
DTEND;VALUE=DATE-TIME:20191011T085500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-104@indico.fis.ucm.es
DESCRIPTION:Speakers: Andrey Chugunov (Ioffe Institute)\nThe Chandrasekhar
-Friedman-Schutz (CFS) instability consist in enhancement of perturbation
s in a rotating star by emission of gravitational waves. In absence of dis
sipation\, all rotating stars should be unstable and the emission of gravi
tational waves should spin down them rapidly. Observations of rapidly rota
ting neutron stars indicates that it is not a case and dissipative process
es suppress the instability in these objects. It allows to constrain prope
rties of dense matter by confronting observations and theoretical models o
f suppression of CFS instability.\nIn this talk\, I describe the mechanism
of the CFS instability\, derive the evolution equation for CFS unstable n
eutron star and describe up-to date observational constraints on the insta
bility windows – the region of temperature and spin frequencies there th
e instability can be unsuppressed without contradictions with observations
. In particular\, I discuss theoretically predicted class of neutron stars
-- HOt and Fast NonAccreting Rotators (HOFNARs) – which can emit persis
tent gravitational waves on cosmological timescale. Special attention is d
evoted to observations of PSR J0952-0607 -- the second fastest known mill
isecond pulsar\, which was recently detected in X-rays\, providing stronge
st constraints to CFS instability in low temperature neutron stars.\n\nhtt
ps://indico.fis.ucm.es/event/3/contributions/104/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/104/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadronization in Terms of First-Order Phase Transition
DTSTART;VALUE=DATE-TIME:20191008T070000Z
DTEND;VALUE=DATE-TIME:20191008T073500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-113@indico.fis.ucm.es
DESCRIPTION:Speakers: Andrew Koshelkin ()\nThe hadronization of the deconf
ined matter arising in high-energy particle collisions is considered in
terms of the first-order phase transition in the multiple flux tube app
roach. Based on the compactification of the standard (3+1) chromodynamics
into $ QCD_{xy} + QCD_{zt}$\, the rate of hadron production in particle
collisions with respect to both the rapidity and $p_T$ distributions is
derived in the flux tube approach. The obtained rate strongly depends on
the energy of the colliding particles\, number of tubes\, hadron mass
as well as on the temperature of the confinement-deconfinement phase tran
sition. Under the concept of the longitudinal dominance and the transverse
confinement in a flux tube\, and provided that the hadronization process
is governed by the phase transition of the first kind\, the hadron rate
is obtained in the explicit form in the multiple tube approach. In th
e case of the pion production in $pp$ collisions we obtain a good agreeme
nt to the experimental results on the pion yield with respect to both
the rapidity and $p_T$ distributions.\n\nhttps://indico.fis.ucm.es/event/3
/contributions/113/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/113/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Large N limits and the golden ratio
DTSTART;VALUE=DATE-TIME:20191008T101000Z
DTEND;VALUE=DATE-TIME:20191008T104500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-114@indico.fis.ucm.es
DESCRIPTION:Speakers: Margarita Garcia Perez (Instituto de Fisica Teorica)
\nWe analyze the low lying spectrum of SU(N) gauge theories on a 2-dimensi
onal spatial torus in a singular large N limit obtained by sending the ran
k of the group to infinity while shrinking the size of the torus to zero.
The absence of tachyonic instabilities along the process leads to constrai
nts on the possible values of N and the magnetic flux on the torus\, singl
ing out a limiting sequence constructed out of Fibonacci numbers. We will
discuss the implications of this observation for non-commutative gauge the
ory and volume reduction.\n\nhttps://indico.fis.ucm.es/event/3/contributio
ns/114/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/114/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$E(38)$ and $Z_0(57)$: possible surprises in the Standard Model
DTSTART;VALUE=DATE-TIME:20191008T155500Z
DTEND;VALUE=DATE-TIME:20191008T163000Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-93@indico.fis.ucm.es
DESCRIPTION:Speakers: George Rupp (CeFEMA\, Instituto Superior Técnico\,
Lisbon)\nWith the reported observation of the Higgs boson at the LHC\, the
Standard Model of particle physics seems to be complete now as for its pa
rticle content. However\, several experimental data at low and intermediat
e energies indicate that there may be two surprises.\n\n The strongest e
vidence concerns $E(38)$\, a very light spinless boson\, probably a scalar
\, with a mass of 38 MeV and decaying into two photons. Theoretical argume
nts and experimental signals supporting its existence will be presented\,
including a very recent direct experimental confirmation at JINR in Dubna.
\n\n The other tentative new boson $Z_0(57)$\, with a mass of about 57 G
eV\, we propose on the basis of small enhancements we observe in several
experiments\, using recent data obtained at the LHC as well as much older
ones from LEP. We interpret this new particle as a pseudoscalar or scalar
partner of a composite $Z$ vector boson.\n\nhttps://indico.fis.ucm.es/even
t/3/contributions/93/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/93/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Cosmology without wave function in conformal time
DTSTART;VALUE=DATE-TIME:20191008T132500Z
DTEND;VALUE=DATE-TIME:20191008T140000Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-118@indico.fis.ucm.es
DESCRIPTION:Speakers: A. V. Yurov ()\nhttps://indico.fis.ucm.es/event/3/c
ontributions/118/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/118/
END:VEVENT
BEGIN:VEVENT
SUMMARY:GENUINE\, MATTER-INDUCED AND INTERFERENCE COMPONENTS OF THE CP\, T
\, CPT ASYMMETRIES IN NEUTRINO OSCILLATIONS
DTSTART;VALUE=DATE-TIME:20191010T082000Z
DTEND;VALUE=DATE-TIME:20191010T085500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-82@indico.fis.ucm.es
DESCRIPTION:Speakers: Jose Bernabeu ()\nThese results represent the culmin
ation of the solution for the historical problem of the contamination by m
atter effects in the discrete CP\, T\, CPT asymmetries for neutrino propag
ation. Using that vacuum is CPT-symmetric and matter is T-symmetric\, the
goal is accomplished in terms of a basis of three independent components:
genuine CPT-even\, matter-induced T-even\, interference CP-even. Independ
ent of the theoretical framework for the dynamics of the active neutrino f
lavors\, we prove the Disentanglement Theorem\nA(CP)=A(CP\,T)+A(CP\,CPT)\,
A(T)=A(T\,CP)+A(T\,CPT)\, A(CPT)=A(CPT\,CP)+A(CPT\,T)\nfor the three inde
pendent experimental asymmetries (left-hand side) in terms of the three co
mponents (right-hand side). For even a T-symmetric matter\, A(T) is -contr
ary to general belief- affected by matter due to quantum interference. \n\
nFor the effective Hamiltonian written as the sum of free mass propagation
plus the matter potential for electron-neutrinos\, the three components h
ave definite parities under the baseline L\, the matter potential "a"\, th
e imaginary part sin(delta) of the PMNS mixing matrix and the hierarchy "h
"=+-1 in the neutrino mass ordering: A(CP\,T) is odd in L and sin(delta) p
lus even in a and h\, A(CP\,CPT) is even in L and sin(delta) plus odd in a
and h\, A(T\,CPT) is odd in all L\, sin(delta)\, a and h. The last interf
erence component contains then\nterms like a.sin(delta).\n\nThe independen
t measurement of the three asymmetries could only be made in neutrino fact
ories and atmospheric neutrinos. For present terrestrial accelerator sourc
es of muon-neutrinos and antineutrinos\, the two components of the appeara
nce CPV asymmetry A(CP) can be disentangled by either baseline dependence
(HKK) or energy dependence (DUNE). At the DUNE baseline\, the higher energ
y region above the first oscillation node provides a dominant matter-induc
ed A(CP\,CPT) component\nand the sign of the experimental asymmetry A(CP)
gives the hierarchy in the neutrino mass ordering. On the contrary\, there
is a "magic energy" E around the second oscillation maximum in which the
fake A(CP\,CPT) component has a first-rank zero whereas the genuine A(CP\,
T) component has a maximum (proportional to sin(delta)). With a modest ene
rgy resolution Delta E ~ 200 MeV an effective zero remains in the matter-i
nduced A(CP\, CPT).\n\nhttps://indico.fis.ucm.es/event/3/contributions/82/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/82/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sterile neutrino dark matter
DTSTART;VALUE=DATE-TIME:20191010T105000Z
DTEND;VALUE=DATE-TIME:20191010T112500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-138@indico.fis.ucm.es
DESCRIPTION:Speakers: Dmitry Gorbunov (INR RAS)\nSterile neutrino is one o
f the well motivated candidate to form the\nDark Matter component in the U
niverse. We discuss standard mechanisms\nof dark matter production in the
early Universe and its modifications\nin the presence of cosmic scalar fie
ld.\n\nhttps://indico.fis.ucm.es/event/3/contributions/138/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/138/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Casimir effect\, scattering processes and bound states in renormal
izable models of interaction of QED fields with two-dimensional materials
DTSTART;VALUE=DATE-TIME:20191008T140500Z
DTEND;VALUE=DATE-TIME:20191008T144000Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-89@indico.fis.ucm.es
DESCRIPTION:Speakers: Yury Pismak (State University of Sankt Petersburg)\n
The method proposed by K. Symanzik for constructing quantum field models i
n an inhomogeneous space-time is used to describe the interaction of the q
uantum electrodynamics (QED) fields with extended material objects. It is
carried out within the framework of quantum field models in which the QED
Lagrangian is modified according to the QED basic principles (locality\, g
auge invariance\, renormalizability) and taking into account the propertie
s of the material medium interacting with QED fields. Models with interact
ions of electromagnetic and Dirac fields with two-dimensional materials of
flat\, spherical and cylindrical shape are considered\, and the specifici
ty of their renormalization procedure is analyzed. The results obtained in
such models for the Casimir effect\, scattering processes and bound state
s are discussed.\n\nhttps://indico.fis.ucm.es/event/3/contributions/89/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/89/
END:VEVENT
BEGIN:VEVENT
SUMMARY:To Positivity and Beyond\, where Higgs-Dilaton Inflation has never
gone before
DTSTART;VALUE=DATE-TIME:20191010T074000Z
DTEND;VALUE=DATE-TIME:20191010T081500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-117@indico.fis.ucm.es
DESCRIPTION:Speakers: Anna Tokareva (Institute for Nuclear Research)\nWe s
tudy the consequences of (beyond) positivity of scattering amplitudes in t
he effective field theory description of the Higgs-Dilaton inflationary mo
del. By requiring the EFT to be compatible with a unitary\, causal\, local
and Lorentz invariant UV completion\, we derive constraints on the Wilson
coefficients of the first higher order derivative operators. We show that
the values allowed by the constraints are consistent with the phenomenolo
gical applications of the Higgs-Dilaton model.\n\nhttps://indico.fis.ucm.e
s/event/3/contributions/117/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/117/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Morgane Fortin: Constraints on neutron star properties (From N*-
Theory workshop)
DTSTART;VALUE=DATE-TIME:20191011T093000Z
DTEND;VALUE=DATE-TIME:20191011T100500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-120@indico.fis.ucm.es
DESCRIPTION:https://indico.fis.ucm.es/event/3/contributions/120/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/120/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Measuring H_0 in PTA with gravitational waves
DTSTART;VALUE=DATE-TIME:20191011T105000Z
DTEND;VALUE=DATE-TIME:20191011T112500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-140@indico.fis.ucm.es
DESCRIPTION:Speakers: Domènec Espriu (University of Barcelona)\nPulsar Ti
ming Arrays have yet to find convincing evidence of gravitational waves. S
ome time ago it was pointed out by one of the authors that a dramatic enha
ncement of the signal would take place for particular values of the angle
subtended by the source and the observed pulsar. This enhancement is due t
o the fact that waves propagate in a Friedmann-Lemaitre-Robertson-Walker m
etric where\, contrary to some wide-spread belief\, a simple harmonic func
tion with a red-shifted frequency is not a solution of the equation of mot
ion. At the first non-trivial order\, proper solutions have an effective w
ave number that differs from the frequency. This leads to some interesting
effects in Pulsar Timing Arrays whose most visible manifestation is the e
nhancement of the signal that\, all other parameters kept fixed\, is relat
ed in a simple manner to the value of H_0.\n\nhttps://indico.fis.ucm.es/ev
ent/3/contributions/140/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/140/
END:VEVENT
BEGIN:VEVENT
SUMMARY:STUDY OF THEE CORE-CRUST TRANSITION IN NEUTRON STARS WITH FINITE-R
ANGE INTERACTIONS: THE DYNAMICAL METHOD
DTSTART;VALUE=DATE-TIME:20191011T080000Z
DTEND;VALUE=DATE-TIME:20191011T083500Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-116@indico.fis.ucm.es
DESCRIPTION:Speakers: Xavier Viñas Gausí (Universitat de Barcelona)\nThe
properties of the core-crust transition in neutron stars are investigated
\nusing effective nuclear forces of finite-range. Special attention is pai
d to the\nso-called dynamical method for locating the transition point\, w
hich\, apart from the stability of the uniform nuclear matter against clus
terization\, also considers contributions due to finite-size effects.In pa
rticular\, contributions to the transition density and pressure from the d
irect and exchange energies are carefully analyzed. To this end\, finite-r
ange forces of Gogny\, Momentum-Dependent\nInteraction (MDI) and Simple Ef
fective Interaction (SEI) types are used in the numerical applications. Th
e results from the dynamical approach are compared with those from the pop
ular thermodynamical method that neglects the surface and Coulomb effects
in the stability condition.In the particular case of the D1M and D1M$^*$ G
ogny forces\, the core-crust transition density and pressure are also comp
ared with the estimate obtained from the crust side making use of a recent
ly calculation of the Equation of State in the inner crust performed with
these Gogny interactions.The dependence of the core-crust transition on th
e stiffness of the symmetry energy of the finite-range models i also addre
ssed. Finally\, we analyze the impact of the transition point on the mass\
, thickness and fraction of the moment of inertia of the neutron star. Pro
minent differences in these crustal properties of the star are found betwe
en using the transition point obtained with the dynamical method or the th
ermodynamical method. It is concluded that the core-crust transition needs
to be ascertained as precisely as possible in order to have realistic est
imates of the observed phenomena where the crust plays a significant role.
\n\nhttps://indico.fis.ucm.es/event/3/contributions/116/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/116/
END:VEVENT
BEGIN:VEVENT
SUMMARY:One-loop quantum-gravitational corrections to the R+R^2 inflationa
ry model
DTSTART;VALUE=DATE-TIME:20191008T124500Z
DTEND;VALUE=DATE-TIME:20191008T132000Z
DTSTAMP;VALUE=DATE-TIME:20210123T155236Z
UID:indico-contribution-3-139@indico.fis.ucm.es
DESCRIPTION:Speakers: Alexey Starobinsky (Landau Institute for Theoretical
Physics RAS)\nQuantum field theory in curved space-time and quantum gravi
ty predict one-loop quantum corrections to the R+R^2 (Starobinsky) inflati
onary model. Observational consequences of a number of such corrections ar
e considered. One of them – the form of the Fourier power spectrum of pr
imordial scalar (matter density) perturbations – has been actually measu
red and has appeared to be in the excellent agreement with the theoretical
prediction. The model also makes the definite prediction for the tensor-t
o-scalar ratio r=3(1-n_s)^2=0.004 which serves as a target for future obse
rvational search. The action of these corrections after inflation provides
the decay of the effective scalar particle in this model (dubbed scalaron
) into pairs of particles and anti-particles of known quantum fields (but
not into pairs of gravitons)\, that is necessary for internal consistency
of the model. Finally\, effect of these corrections on the background dyna
mics during inflation can be calculated and compared with data. In this ca
se no noticeable effect is found\, and only upper bounds on quantum correc
tions are obtained. This has been expected since the relative smallness of
these corrections is caused by the appearance of new hierarchy - the anom
alously large value of the dimensionless coefficient in front of the R^2 t
erm that finally follows from the actual amount of present large-scale inh
omogeneity of the Universe. The large value of the effective R^2 term comp
ared to the Weyl squared one also makes possible to consider the model non
-perturbatively in the scalar sector (where it is renormalizable) for curv
atures much less than the Planck one\, while corrections in the tensor sec
tor are still small.\n\nhttps://indico.fis.ucm.es/event/3/contributions/13
9/
LOCATION:Facultad de Ciencias Físicas\, Universidad Complutense de Madrid
Aula M2
URL:https://indico.fis.ucm.es/event/3/contributions/139/
END:VEVENT
END:VCALENDAR