Fluctuation Spectrum from a Scalar-Tensor Bimetric Gravity Theory

Abstract

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.

14 pages, uses amsmath, amssymb

References in corpus (3)

• Cosmological implications of the MAXIMA-I high resolution Cosmic Microwave Background anisotropy measurement
• On Signatures of Short Distance Physics in the Cosmic Microwave Background
• Bimetric Gravity Theory, Varying Speed of Light and the Dimming of Supernovae

Cited by in corpus (5)

• New varying speed of light theories
• Disformal Inflation
• Bimetric varying speed of light theories and primordial fluctuations
• Scale Invariant Spectrum from Variable Speed of Light Metric in a Bimetric Gravity Theory
• Variable Speed of Light Cosmology and Bimetric Gravity: An Alternative to Standard Inflation