Primordial fluctuations from inflation in dRGT bimetric theory of gravity

Journal Article · Mon Sep 19 04:00:00 EDT 2016 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2016/09/033· OSTI ID:22572153

Sakakihara, Yuki ^[1]; Tanaka, Takahiro ^[1]

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1. Department of Physics, Kyoto University,Kyoto 606-8502 (Japan)

We investigate primordial gravitational waves and curvature perturbations in de Rham-Gabadadze-Tolley (dRGT) bimetric gravity. We evaluate the power-spectra in the leading order in slow roll. Taking into account the decay of massive graviton, we find that the action up to the second order reduces to the Einstein theory with a non-minimally coupled scalar field, which is simplified to a minimally coupled model by conformal transformation. We also find that the tensor to scalar ratio for large field inflation with power law potential is larger than the general relativity counterpart for any choice of parameters in dRGT bimetric gravity. In addition, we confirm that the usual consistency relation holds and we have a steeper spectrum for gravitational waves.

• Sponsoring Organization: SCOAP3, CERN, Geneva (Switzerland)
• OSTI ID: 22572153
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 09 Vol. 2016; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACTION INTEGRAL
CONFORMAL INVARIANCE
COSMOLOGICAL INFLATION
GENERAL RELATIVITY THEORY
GRAVITATIONAL WAVES
INFLATIONARY UNIVERSE
METRICS
PERTURBATION THEORY
SCALAR FIELDS