Cosmology and Stability in Scalar-Tensor bigravity

Abstract

The bigravity models coupled with two scalar fields are constructed. We show that a wide class of the expansion history of the universe, especially corresponding to dark energy and/or inflation, can be described by a solution of the bigravity model. We discuss the stability of the solution and give the conditions for the stability. We also explicitly construct a model which gives a stable solution. By using the stable model, for an arbitrary evolution of the universe expansion, we construct the Brans-Dicke like model which reproduces the evolution.

LaTeX 13 pages, no figure, version to appear in Classical and Quantum Gravity

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• Cosmology of F(R) nonlinear massive gravity
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• New massive bigravity cosmologies with double matter coupling
• Compatibility between the scalar field models of tachyon, $k$-essence and quintessence in $f(R,T)$ gravity
• Properties of Bigravity Solutions in a Solvable Class
• On the stability of Einstein static universe at background level in massive bigravity
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• Cosmological evolutions of $F(R)$ nonlinear massive gravity
• Cosmology and stability in scalar tensor bigravity with non-minimal kinetic coupling gravity
• GR-GSG Hybrid Gravity