De Sitter ground state of scalar-tensor gravity and its primordial perturbation

Details De Sitter ground state of scalar-tensor gravity and its primordial perturbation De Sitter ground state of scalar-tensor gravity and its primordial perturbation

2010-07-19

arxiv.org/abs/1007.3096v2

JHEP 1106:043,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages

Scientific paper

10.1007/JHEP06(2011)043

Scalar-tensor gravity is one of the most competitive gravity theory to Einstein's relativity. We reconstruct the exact de Sitter solution in scalar-tensor gravity, in which the non-minimal coupling scalar is rolling along the potential. This solution may have some relation to the early inflation and present acceleration of the universe. We investigated its primordial quantum perturbation around the adiabatic vacuum. We put forward for the first time that exact de Sitter generates non-exactly scale invariant perturbations. In the conformal coupling case, this model predicts that the tensor mode of the perturbation (gravity wave) is strongly depressed.

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