Can a spectator scalar field enhance inflationary tensor mode?

Tomohiro Fujita, Jun'Ichi Yokoyama, Shuichiro Yokoyama

研究成果: Article査読

24 被引用数 (Scopus)

抄録

We consider the possibility of enhancing the inflationary tensor mode by introducing a spectator scalar field with a small sound speed which induces gravitational waves as a second-order effect.We analytically obtain the power spectra of gravitational waves and curvature perturbation induced by the spectator scalar field. We find that the small sound speed amplifies the curvature perturbation much more than the tensor mode and the current observational constraint forces the induced gravitational waves to be negligible compared with those from the vacuum fluctuation during inflation.

本文言語English
論文番号043E01
ジャーナルProgress of Theoretical and Experimental Physics
2015
4
DOI
出版ステータスPublished - 2015
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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