Cosmology with massive gravitons and scalar fields

by Michele Oliosi (Yukawa Institute for Theoretical Physics, University of Kyoto)

Thursday 15 Nov 2018, 13:15 → 14:00 Europe/Stockholm

Nordita 132:028

In this talk, I will present two specific theories in which an additional scalar field can be invoked to simplify the cosmology of massive spin-2 theories. I will first talk about the minimal theory of quasidilaton massive gravity, a Lorentz-breaking theory of massive gravity + scalar field, propagating only 3 degrees of freedom. Then, I will describe an example realization of chameleon bigravity, showing how including a chameleon scalar allows to easily reach higher energies without violating the Higuchi bound.