Beyond fin formalism

Atsushi Naruko, Yu Ichi Takamizu, Misao Sasaki

Research output: Contribution to conferencePaperpeer-review

Abstract

We develop a theory of nonlinear cosmological perturbations on superhorizon scales for a multi-component scalar field in the context of inationary cosmology. We employ the ADM formalism and the spatial gradient expansion approach. We provide a formalism to obtain the solution in the multi field case up to the order of ε2 where ε = 1=(HL) is a small parameter representing the ratio of the Hubble radius to the characteristic length scale L of perturbation. This formalism can be applied to the calculation of the superhorizon evolution of the primordial non-Gaussianity beyond the so-called δN formalism, equivalent to O(ε0).

Original languageEnglish
Pages178-181
Number of pages4
Publication statusPublished - 2011 Jan 1
Event21st Workshop on General Relativity and Gravitation in Japan, JGRG 2011 - Sendai, Japan
Duration: 2011 Sep 262011 Sep 29

Other

Other21st Workshop on General Relativity and Gravitation in Japan, JGRG 2011
CountryJapan
CitySendai
Period11/9/2611/9/29

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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