The viability of potential-driven galileon inflation

Junko Ohashi, Shinji Tsujikawa

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルOn Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories
編集者Kjell Rosquist, Robert T. Jantzen, Remo Ruffini, Remo Ruffini
出版社World Scientific
ページ1522-1524
ページ数3
210699
ISBN(印刷版)9789814612142
DOI
出版ステータスPublished - 2015
外部発表はい
イベント13th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation, and Relativistic Field Theories, MG13 2012 - Stockholm, Sweden
継続期間: 2015 7 12015 7 7

出版物シリーズ

名前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
番号210699

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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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