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A simple approach to the study of background cosmology in bigravity

Prado Martín-Moruno
Universidad Complutense de Madrid

In this talk I will consider two ansatzs relating the causal structure of two metrics that can allow us to investigate bigravity solutions in a simple way. For the solutions that satisfy the Generalized Gordon Ansatz the effect of the second gravitational sector is equivalent to that produced by a perfect fluid. On the other hand, this effect is equivalent to a null fluid for solutions fulfilling the Kerr-Schild Ansatz. I will apply this approach to cosmological solutions, noting that the Generalized Gordon solutions are described by FLRW metrics whereas the Kerr-Schild solutions imply a Bianchi I metric. In both cases the experimental measures of the CMB dipole impose restrictions on the magnitude of the velocities of the common cosmic fluids.

2017 March 06, 12:00

Faculdade de Ciências da Universidade de Lisboa (C6.2.51)
Campo Grande, 1749-016 Lisboa

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia