Gravitational effects on inflaton decay

Journal Article · Fri May 22 00:00:00 EDT 2015 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2015/05/038· OSTI ID:22458435

Ema, Yohei; Jinno, Ryusuke; Mukaida, Kyohei ^[1]; Nakayama, Kazunori ^[1]

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1. Department of Physics, University of Tokyo,Tokyo 113-0033 (Japan)

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.

• Sponsoring Organization: SCOAP3, CERN, Geneva (Switzerland)
• OSTI ID: 22458435
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2015, 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); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMOLOGICAL INFLATION
GRAVITATIONAL WAVES
GRAVITONS
HUBBLE EFFECT
OSCILLATIONS
PARTICLE PRODUCTION