Publication Details:

Established in 2008

Journal or Publication Title:

Armenian Journal of Physics=Ֆիզիկայի հայկական հանդես

Date of publication:

2017

Volume:

10

Number:

4

ISSN:

1829-1171

Official URL:

Corporate Creators:

Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany

Coverage:

171-184

Abstract:

The theory of massive bigravity is an interesting alternative to the standard ΛCDM cosmology. However, despite its phenomenological success at the background level, the theory in its original formulation suffers from different instabilities at the perturbation level. One of the suggestions to cure the theory from these unwilling instabilities was to discuss the possibility of other geometrical forms for both metrics different from previously only studied FRLW-FRLW case. In this work, with the help of a simple example, we show that even if initially we chose a metric combination different from FRLW-FRLW case, in the late times of the cosmic evolution metrics asymptotically approach to the FRLW-FRLW structure. This therefore means that at late times we will have again the same instability issues similar to the previously studied cases of FRLW-FRLW metric combination.

Date created:

2017-12-27

Format:

pdf

Identifier:

oai:arar.sci.am:23491

Location of original object:

ՀՀ ԳԱԱ Հիմնարար գիտական գրադարան