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 language | English |
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| Title of host publication | Proceedings of the 18th Workshop on General Relativity and Gravitation in Japan, JGRG 2008 |
| Publication status | Published - 2008 |
| Externally published | Yes |
| Event | 18th Workshop on General Relativity and Gravitation in Japan, JGRG 2008 - Higashi-Hiroshima Duration: 2008 Nov 17 → 2008 Nov 21 |
Other
| Other | 18th Workshop on General Relativity and Gravitation in Japan, JGRG 2008 |
|---|---|
| City | Higashi-Hiroshima |
| Period | 08/11/17 → 08/11/21 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
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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