Oscillatory features in the curvature power spectrum after a sudden turn of the inflationary trajectory

Xian Gao, David Langlois, Shuntaro Mizuno

研究成果: Article査読

37 被引用数 (Scopus)

抄録

In the context of two-field inflation characterized by a light direction and a heavy direction, we revisit the question of the impact of the massive modes on the power spectrum produced after a turn in the inflationary trajectory. We consider in particular the resonant effect due to the background oscillations following a sharp turn. Working in the mass basis, i.e. in the basis spanned by the eigenvectors of the effective mass matrix for the perturbations, we provide an analytical estimate of the resonant effect, using the in-in formalism. In comparison with earlier estimates, we find the same the spectral dependence but a smaller amplitude. We also compute, again via the in-in formalism, the effect of the direct coupling between the light and heavy modes at the instant of the turn and confirm our previous results obtained via a different method.

本文言語English
論文番号023
ジャーナルJournal of Cosmology and Astroparticle Physics
2013
10
DOI
出版ステータスPublished - 2013 10月
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学

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