Primordial gravitational waves in bimetric gravity

• 榊原, 由貴

• Soda, Jiro

抄録

We study primordial tensor power-spectra generated during inflation in bimetric gravity. More precisely, we examine a homogeneous expanding spacetime in a minimal bimetric model with an inflaton and calculate tensor perturbations on the homogeneous background under slow-roll approximation. In terms of the mass eigenstates, only the power-spectrum of the massless state remains constant and both the power-spectrum of the massive state and the cross power-spectrum rapidly decay during inflation. The amplitude of the physical power-spectrum is suppressed due to the flavor mixing. All power-spectra in the flavor eigenstates coincide with each other up to the first order of the slow-roll parameter.

収録刊行物

• Journal of Cosmology and Astroparticle Physics

  Journal of Cosmology and Astroparticle Physics 2015 2015-09-02

  IOP Publishing

キーワード

• inflation
• primordial gravitational waves (theory)

詳細情報

• CRID: 1050845760768361984
• NII論文ID: 120005841437
• ISSN: 14757516
• HANDLE: 2433/216583
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles