Fluctuation Spectrum from a Scalar-Tensor Bimetric Gravity Theory

Details Fluctuation Spectrum from a Scalar-Tensor Bimetric Gravity Theory Fluctuation Spectrum from a Scalar-Tensor Bimetric Gravity Theory

2002-03-11

arxiv.org/abs/astro-ph/0203164v1

Int.J.Mod.Phys. D12 (2003) 697-712

Astronomy and Astrophysics

Astrophysics

14 pages, uses amsmath, amssymb

Scientific paper

10.1142/S0218271803003098

Predictions of the CMB spectrum from a bimetric gravity theory (gr-qc/0101126) are presented. The initial inflationary period in BGT is driven by a vanishingly small speed of gravitational waves v_g in the very early universe. This initial inflationary period is insensitive to the choice of scalar field potential and initial values of the scalar field. After this initial period of inflation, v_g will increase rapidly and the effects of a potential will become important. We show that a quadratic potential introduced into BGT yields an approximately flat spectrum with inflation parameters: n_s=0.98, n_t=-0.027, alpha_s=-3.2e-4 and alpha_t=-5.0e-4, with r >= 0.014.

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