Cosmology and Stability in Scalar-Tensor bigravity

Autor:	Bamba, Kazuharu, Kokusho, Yusuke, Nojiri, Shin'ichi, Shirai, Norihito
Rok vydání:	2013
Předmět:	High Energy Physics - Theory Astrophysics - Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology
Druh dokumentu:	Working Paper
DOI:	10.1088/0264-9381/31/7/075016
Popis:	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. Comment: LaTeX 13 pages, no figure, version to appear in Classical and Quantum Gravity
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1310.1460 Zobrazit plný text záznamu View this record from Arxiv