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

Abstract

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.

Authors:
; ;  [1];  [2]
  1. Department of Physics, Faculty of Science, The University of Tokyo, Bunkyo-ku, Tokyo 133-0033 (Japan)
  2. Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583 (Japan)
Publication Date:
OSTI Identifier:
22525281
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGICAL INFLATION; COSMOLOGY; COUPLING; DISTURBANCES; EVOLUTION; GRAVITATION; GRAVITONS; INFLATIONARY UNIVERSE; INFLATONS; PARTICLE PRODUCTION; SCALARS; SOUND WAVES; VELOCITY

Citation Formats

Ema, Yohei, Jinno, Ryusuke, Nakayama, Kazunori, and Mukaida, Kyohei, E-mail: ema@hep-th.phys.s.u-tokyo.ac.jp, E-mail: jinno@hep-th.phys.s.u-tokyo.ac.jp, E-mail: kyohei.mukaida@ipmu.jp, E-mail: kazunori@hep-th.phys.s.u-tokyo.ac.jp. Particle production after inflation with non-minimal derivative coupling to gravity. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/10/020.
Ema, Yohei, Jinno, Ryusuke, Nakayama, Kazunori, & Mukaida, Kyohei, E-mail: ema@hep-th.phys.s.u-tokyo.ac.jp, E-mail: jinno@hep-th.phys.s.u-tokyo.ac.jp, E-mail: kyohei.mukaida@ipmu.jp, E-mail: kazunori@hep-th.phys.s.u-tokyo.ac.jp. Particle production after inflation with non-minimal derivative coupling to gravity. United States. doi:10.1088/1475-7516/2015/10/020.
Ema, Yohei, Jinno, Ryusuke, Nakayama, Kazunori, and Mukaida, Kyohei, E-mail: ema@hep-th.phys.s.u-tokyo.ac.jp, E-mail: jinno@hep-th.phys.s.u-tokyo.ac.jp, E-mail: kyohei.mukaida@ipmu.jp, E-mail: kazunori@hep-th.phys.s.u-tokyo.ac.jp. Thu . "Particle production after inflation with non-minimal derivative coupling to gravity". United States. doi:10.1088/1475-7516/2015/10/020.
@article{osti_22525281,
title = {Particle production after inflation with non-minimal derivative coupling to gravity},
author = {Ema, Yohei and Jinno, Ryusuke and Nakayama, Kazunori and Mukaida, Kyohei, E-mail: ema@hep-th.phys.s.u-tokyo.ac.jp, E-mail: jinno@hep-th.phys.s.u-tokyo.ac.jp, E-mail: kyohei.mukaida@ipmu.jp, E-mail: kazunori@hep-th.phys.s.u-tokyo.ac.jp},
abstractNote = {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.},
doi = {10.1088/1475-7516/2015/10/020},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 10,
volume = 2015,
place = {United States},
year = {2015},
month = {10}
}