Non-Gaussianities from ekpyrotic collapse with multiple fields

Shuntaro Mizuno, Kazuya Koyama, Filippo Vernizzi, David Wands

研究成果: Conference contribution

抄録

We compute the non-Gaussianity of the curvature perturbation generated by ekpyrotic collapse with multiple fields. The transition from the multi-field scaling solution to a single-field dominated regime converts initial isocurvature field perturbations to an almost scale-invariant comoving curvature perturbation. In the specific model of two fields, Ø1 and Ø2, with exponential potentials, -Vi exp(ciØi), we calculate the bispectrum of the resulting curvature perturbation. We find that the non-Gaussianity is dominated by non-linear evolution on super-Hubble scales and hence is of the local form. The non-linear parameter of the curvature perturbation is given by fNL = 5c2 j=12, where c j is the exponent of the potential for the field which becomes sub-dominant at late times.

本文言語English
ホスト出版物のタイトルProceedings of the 17th Workshop on General Relativity and Gravitation in Japan, JGRG 2007
ページ165-168
ページ数4
出版ステータスPublished - 2007
外部発表はい
イベント17th Workshop on General Relativity and Gravitation in Japan, JGRG 2007 - Nagoya
継続期間: 2007 12 32007 12 7

Other

Other17th Workshop on General Relativity and Gravitation in Japan, JGRG 2007
CityNagoya
Period07/12/307/12/7

ASJC Scopus subject areas

  • 原子分子物理学および光学

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