Speakers
Mr
Diego TessainerMr
Jaramillo Darío
Description
We reflect on the possibility of breaking the diffeomorphism (Diff) invariance in the gravitational couplings of matter down to only transverse diffeomorphisms (TDiff), and study the consequences on scalar field theories. We begin by analyzing the general implications of this restricted symmetry for a single scalar field within a general setting. Afterwards, we study the cosmological scenario by considering shift-symmetric multi-field TDiff theories (with the cosmological dark sector in mind), finding that there is an effective interaction between dark sector components as a result of the broken symmetry. The theoretical predictions of our cosmological models are contrasted with observational data from the CMB and Type Ia supernovae.
