Stable cosmological solutions in degenerate theory of gravity

Ryotaro Kase, Rampei Kimura, Atsushi Naruko, Daisuke Yoshida

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We study cosmological applications of extended vector–tensor theories, whose Lagrangians contain up to two derivatives with respect to metric and vector field. We derive background equations under the assumption of homogeneous and isotropic universe and study the nature of cosmological perturbations on top of the background. We found an example of healthy cosmological solutions in non-trivial degenerate theory of gravity for the first time, where those perturbations do not suffer from any instabilities, that is, ghost and gradient instabilities.

Original languageEnglish
Pages (from-to)320-325
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 2018 Aug 10
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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