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Title: Gravitational effects on inflaton decay

Abstract

We point out that the inflaton inevitably couples to all non-conformally coupled matters gravitationally through an oscillation in the Hubble parameter or the cosmic scale factor. It leads to particle production during the inflaton oscillation regime, which is most efficient just after inflation. Moreover, the analysis is extended to the model with non-minimal inflaton couplings to gravity, in which the Hubble parameter oscillates more violently. We apply our results to the graviton production by the inflaton: gravitons are also produced just after inflation, but the non-minimal coupling does not induce inflaton decay into the graviton pair.

Authors:
; ;  [1];  [1];  [2]
  1. Department of Physics, University of Tokyo,Tokyo 113-0033 (Japan)
  2. (Japan)
Publication Date:
Sponsoring Org.:
SCOAP3, CERN, Geneva (Switzerland)
OSTI Identifier:
22458435
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 05; Other Information: PUBLISHER-ID: JCAP05(2015)038; OAI: oai:repo.scoap3.org:10410; cc-by Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COSMOLOGICAL INFLATION; GRAVITATIONAL WAVES; GRAVITONS; HUBBLE EFFECT; OSCILLATIONS; PARTICLE PRODUCTION

Citation Formats

Ema, Yohei, Jinno, Ryusuke, Mukaida, Kyohei, Nakayama, Kazunori, and Kavli IPMU, TODIAS, University of Tokyo,Kashiwa 277-8583. Gravitational effects on inflaton decay. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/05/038.
Ema, Yohei, Jinno, Ryusuke, Mukaida, Kyohei, Nakayama, Kazunori, & Kavli IPMU, TODIAS, University of Tokyo,Kashiwa 277-8583. Gravitational effects on inflaton decay. United States. doi:10.1088/1475-7516/2015/05/038.
Ema, Yohei, Jinno, Ryusuke, Mukaida, Kyohei, Nakayama, Kazunori, and Kavli IPMU, TODIAS, University of Tokyo,Kashiwa 277-8583. Fri . "Gravitational effects on inflaton decay". United States. doi:10.1088/1475-7516/2015/05/038.
@article{osti_22458435,
title = {Gravitational effects on inflaton decay},
author = {Ema, Yohei and Jinno, Ryusuke and Mukaida, Kyohei and Nakayama, Kazunori and Kavli IPMU, TODIAS, University of Tokyo,Kashiwa 277-8583},
abstractNote = {We point out that the inflaton inevitably couples to all non-conformally coupled matters gravitationally through an oscillation in the Hubble parameter or the cosmic scale factor. It leads to particle production during the inflaton oscillation regime, which is most efficient just after inflation. Moreover, the analysis is extended to the model with non-minimal inflaton couplings to gravity, in which the Hubble parameter oscillates more violently. We apply our results to the graviton production by the inflaton: gravitons are also produced just after inflation, but the non-minimal coupling does not induce inflaton decay into the graviton pair.},
doi = {10.1088/1475-7516/2015/05/038},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 05,
volume = 2015,
place = {United States},
year = {Fri May 22 00:00:00 EDT 2015},
month = {Fri May 22 00:00:00 EDT 2015}
}