Non-gaussianity from the bispectrum in general multiple field inflation

Shuntaro Mizuno, Frederico Arroja, Kazuya Koyama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We study the non-gaussianity from the bispectrum in multi-field inflation models with a general kinetic term. The models include the multi-field K-inflation and the multi-field Dirac-Born-Infeld (DBI) inflation as special cases. We derive the three point function for the curvature perturbation which depends on both adiabatic and entropy perturbations, in the small sound speed limit and at leading order in the slow-roll expansion. The contribution from the entropy perturbations has a different momentum dependence if the sound speed for the entropy perturbations is different from the adiabatic one, which provides a possibility to distinguish the multi-field models from single field models.

Original languageEnglish
Title of host publicationProceedings of the 18th Workshop on General Relativity and Gravitation in Japan, JGRG 2008
Publication statusPublished - 2008
Externally publishedYes
Event18th Workshop on General Relativity and Gravitation in Japan, JGRG 2008 - Higashi-Hiroshima
Duration: 2008 Nov 172008 Nov 21

Other

Other18th Workshop on General Relativity and Gravitation in Japan, JGRG 2008
CityHigashi-Hiroshima
Period08/11/1708/11/21

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fingerprint Dive into the research topics of 'Non-gaussianity from the bispectrum in general multiple field inflation'. Together they form a unique fingerprint.

  • Cite this

    Mizuno, S., Arroja, F., & Koyama, K. (2008). Non-gaussianity from the bispectrum in general multiple field inflation. In Proceedings of the 18th Workshop on General Relativity and Gravitation in Japan, JGRG 2008