Orateur
Vitor da Fonseca
(Institute of Astrophysics and Space Siences (Lisbon, Portugal))
Description
Mass-varying neutrino models with strong scalar couplings are typically affected by late-time perturbative instabilities. In this talk, I present an inverse symmetron-like phase transition in which the neutrino nonrelativistic transition activates the fifth force, while the subsequent dilution of the neutrino density restores the symmetry and suppresses the coupling. This mechanism avoids excessive linear growth at late times and can generate a transient early dark energy component near recombination, with possible implications for the Hubble tension.
Auteurs
David F. Mota
Eric V. Linder
Mainak Baidya
Øyvind Christiansen
Vitor da Fonseca
(Institute of Astrophysics and Space Siences (Lisbon, Portugal))