The viability of potential-driven galileon inflation

Junko Ohashi, Shinji Tsujikawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A Galileon-like nonlinear self-interaction (∂φ)2 □φ generally leads to a enhanced friction during inflation, by which even steep potentials for the standard inflation can drive cosmic acceleration. However if the Galileon term is dominant by the end of inflation, this can affect the field oscillation during reheating and the scalar propagation speed squared c2s can be negative, which leads to the instability of small-scale perturbations. For chaotic inflation and natural inflation we clarify the parameter space in which the field oscillates coherently during reheating. Moreover we place observational constraints of the scalar spectral index ns and the tensor-to-scalar ratio r.

Original languageEnglish
Title of host publicationOn Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories
EditorsKjell Rosquist, Robert T. Jantzen, Remo Ruffini, Remo Ruffini
PublisherWorld Scientific
Pages1522-1524
Number of pages3
Edition210699
ISBN (Print)9789814612142
DOIs
Publication statusPublished - 2015
Externally publishedYes
Event13th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation, and Relativistic Field Theories, MG13 2012 - Stockholm, Sweden
Duration: 2015 Jul 12015 Jul 7

Publication series

NameThe 13th Marcel Grossmann Meeting: On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Proceedings of the MG13 Meeting on General Relativity, 2012
Number210699

Conference

Conference13th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation, and Relativistic Field Theories, MG13 2012
CountrySweden
CityStockholm
Period15/7/115/7/7

Keywords

  • Cosmic microwave background
  • Cosmological perturbation theory
  • Inflation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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  • Cite this

    Ohashi, J., & Tsujikawa, S. (2015). The viability of potential-driven galileon inflation. In K. Rosquist, R. T. Jantzen, R. Ruffini, & R. Ruffini (Eds.), On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories (210699 ed., pp. 1522-1524). (The 13th Marcel Grossmann Meeting: On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Proceedings of the MG13 Meeting on General Relativity, 2012; No. 210699). World Scientific. https://doi.org/10.1142/9789814623995_0213