1 research outputs found
The cosmology of interacting spin-2 fields
We investigate the cosmology of interacting spin-2 particles, formulating
the multi-gravitational theory in terms of vierbeins and without imposing
any Deser-van Nieuwen-huizen-like constraint. The resulting
multi-vierbein theory represents a wider class of gravitational theories if
compared to the corresponding multi-metric models. Moreover, as opposed to
its metric counterpart which in general seems to contain ghosts, it has
already been proved to be ghost-free. We outline a discussion about the
possible matter couplings and we focus on the study of cosmological scenarios
in the case
of three and four interacting vierbeins. We find rich behavior, including de
Sitter solutions
with an effective cosmological constant arising from the multi-vierbein
interaction,
dark-energy solutions and nonsingular bouncing behavior