Particle production after inflation with non-minimal derivative coupling to gravity

Yohei Ema, Ryusuke Jinno, Kyohei Mukaida, Kazunori Nakayama

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


We study cosmological evolution after inflation in models with non-minimal derivative coupling to gravity. The background dynamics is solved and particle production associated with rapidly oscillating Hubble parameter is studied in detail. In addition, production of gravitons through the non-minimal derivative coupling with the inflaton is studied. We also find that the sound speed squared of the scalar perturbation oscillates between positive and negative values when the non-minimal derivative coupling dominates over the minimal kinetic term. This may lead to an instability of this model. We point out that the particle production rates are the same as those in the Einstein gravity with the minimal kinetic term, if we require the sound speed squared is positive definite.

Original languageEnglish
Article number020
JournalJournal of Cosmology and Astroparticle Physics
Issue number10
Publication statusPublished - 2015 Oct 8
Externally publishedYes


  • ination
  • modified gravity
  • physics of the early universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics


Dive into the research topics of 'Particle production after inflation with non-minimal derivative coupling to gravity'. Together they form a unique fingerprint.

Cite this