Spatially covariant theories of gravity: Disformal transformation, cosmological perturbations and the Einstein frame

Tomohiro Fujita, Xian Gao, Jun'ichi Yokoyama

研究成果: Article査読

9 被引用数 (Scopus)

抄録

We investigate the cosmological background evolution and perturbations in a general class of spatially covariant theories of gravity, which propagates two tensor modes and one scalar mode. We show that the structure of the theory is preserved under the disformal transformation. We also evaluate the primordial spectra for both the gravitational waves and the curvature perturbation, which are invariant under the disformal transformation. Due to the existence of higher spatial derivatives, the quadratic Lagrangian for the tensor modes itself cannot be transformed to the form in the Einstein frame. Nevertheless, there exists a one-parameter family of frames in which the spectrum of the gravitational waves takes the standard form in the Einstein frame.

本文言語English
論文番号014
ジャーナルJournal of Cosmology and Astroparticle Physics
2016
2
DOI
出版ステータスPublished - 2016 2 4
外部発表はい

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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