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Armenian Journal of Physics=Ֆիզիկայի հայկական հանդես
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Title:
The FRLW-FRLW metric combination as an attractor solution in bigravity
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Physics ; Quantum mechanics, field theories, and special relativity
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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.