Cosmological Solution Moduli of Bigravity
Nejat Tevfik Yilmaz
TL;DR
This paper derives the full set of cosmological solutions in ghost-free bigravity where the g-metric is FLRW, revealing the complete background solution space with an effective fluid contribution from the interaction.
Contribution
It provides the complete classification of metric solutions in bigravity with FLRW g-metric, expanding understanding of cosmological backgrounds in the theory.
Findings
Derived the full set of cosmological solutions for bigravity with FLRW g-metric.
Identified the effective fluid behavior arising from the interaction Lagrangian.
Mapped the exact background solution space of the theory.
Abstract
We construct the complete set of metric-configuration solutions of the ghost-free massive bigravity for the scenario in which the g-metric is the Friedmann-Lemaitre-Robertson-Walker (FLRW) one, and the interaction Lagrangian between the two metrics contributes an effective ideal fluid energy-momentum tensor to the g-metric equations. This set corresponds to the exact background cosmological solution space of the theory.
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