Conveners
Plenary: Plenary 1
- Thomas Steingasser (IFT)
Plenary: Plenary 2
- Thomas Steingasser (IFT)
Plenary: Plenary 3
- Jose A. R. Cembranos (IPARCOS-UCM)
Plenary: Plenary 4
- Jose A. R. Cembranos (IPARCOS-UCM)
Plenary: Plenary 5
- Juan José Sanz Cillero (Universidad Complutense de Madrid & IPARCOS)
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Aaron Held (École Normale Supérieure)10/21/26, 9:30 AM
The Standard Model of particle physics, in particular the Higgs potential, exhibits hints of fundamental quantum scale symmetry. At the same time, the asymptotic safety program has gathered substantial evidence for a nonperturbative fixed point of gravitational interactions. If this gravitational fixed point induces a UV completion of the Standard Model, it offers a compelling explanation for...
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Manuel Reichert (University of Sussex)10/21/26, 10:15 AM
The functional renormalisation group is a powerful non-perturbative tool for the computation of the vacuum and finite-temperature effective potential. It is automatically IR-finite and includes the resummation of bubble diagrams, similar to Daisy and super-Daisy resummations in perturbation theory. I will introduce this tool and, as an example, show its application to the electroweak phase...
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David Mulryne (Queen Mary University of London)10/21/26, 11:40 AM
The metastability of the Higgs potential raises a long-standing fundamental question for early-universe cosmology: what is the nonlinear fate of rare inflationary fluctuations that cross a potential barrier into a negative-energy region? Using fully nonlinear spherically symmetric numerical relativity, we investigate the evolution of such fluctuations in a radiation-dominated universe. We find...
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10/21/26, 12:25 PM
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José R. Espinosa (IFT, Madrid)10/22/26, 9:30 AM
In the standard picture, the decay of a false vacuum in a single-field potential is described by a semiclassical Euclidean bounce, but the decay landscape can be much richer. Sometimes no bounce exists and the decay proceeds via a different kind of field configurations, called pseudo-bounces. Some other potentials have more than one bounce, including antibounces, configurations with the...
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Giulio Barni (IFT-UAM/CSIC Madrid)10/22/26, 10:15 AM
Semiclassical tunneling is usually formulated in Euclidean time, but for non-trivial initial states the appropriate Euclidean saddle and boundary conditions are not always obvious. I will introduce real-time path-integral approaches to tunneling, focusing on the steadyon construction based on complex semiclassical saddles, and use it to clarify how conserved quantities are incorporated.
I...
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marieke postma (Nikhef)10/23/26, 9:30 AM
Everything in our universe is made of matter and not antimatter, and we do not understand why. An exciting possibility is that this asymmetry between baryons and antibaryons was created during the electroweak phase transition, in a process called electroweak baryogenesis. The scenario requires new physics at the electroweak scale, which can be tested by experiments. Much progress has been...
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David Weir (University of Helsinki)10/23/26, 10:15 AM
A leading candidate for a stochastic source of primordial gravitational waves would be a first order phase transition. Strong electroweak-scale phase transitions in particular stand a good chance of being constrained by gravitational wave data from future missions such as LISA and Taiji, and thus it is important to understand the signal from strong transitions. However, strong transitions also...
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David Kaiser (MIT)10/23/26, 11:40 AM
Exploding primordial black holes can source baryon asymmetry soon after the electroweak phase transition, as high-energy Hawking radiation drives ultrarelativistic shocks in the surrounding plasma. The shocks and their trailing rarefaction waves delineate two bubble-like walls around a shell of superheated fluid, in which electroweak symmetry is restored. These moving interfaces source chiral...
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