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Title: Observational Signatures and Non-Gaussianities ofGeneral Single Field Inflation

Abstract

We perform a general study of primordial scalar non-Gaussianities in single field inflationary models. We consider models where the inflaton Lagrangian is an arbitrary function of the scalar field and its first derivative, and the sound speed is arbitrary. We find that under reasonable assumptions, the non-Gaussianity is completely determined by 5 parameters. In special limits of the parameter space, one finds distinctive ''shapes'' of the non-Gaussianity. In models with a small sound speed, several of these shapes would become potentially observable in the near future. Different limits of our formulae recover various previously known results.

Authors:
; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
881956
Report Number(s):
SLAC-PUB-11840
hep-th/0605045; TRN: US200612%%879
DOE Contract Number:
AC02-76SF00515
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; INFLATIONARY UNIVERSE; LAGRANGIAN FUNCTION; SCALAR FIELDS; Theory-HEP,HEPTH

Citation Formats

Chen, Xingang, Huang, Min-xin, Kachru, Shamit, and Shiu, Gary. Observational Signatures and Non-Gaussianities ofGeneral Single Field Inflation. United States: N. p., 2006. Web. doi:10.2172/881956.
Chen, Xingang, Huang, Min-xin, Kachru, Shamit, & Shiu, Gary. Observational Signatures and Non-Gaussianities ofGeneral Single Field Inflation. United States. doi:10.2172/881956.
Chen, Xingang, Huang, Min-xin, Kachru, Shamit, and Shiu, Gary. Fri . "Observational Signatures and Non-Gaussianities ofGeneral Single Field Inflation". United States. doi:10.2172/881956. https://www.osti.gov/servlets/purl/881956.
@article{osti_881956,
title = {Observational Signatures and Non-Gaussianities ofGeneral Single Field Inflation},
author = {Chen, Xingang and Huang, Min-xin and Kachru, Shamit and Shiu, Gary},
abstractNote = {We perform a general study of primordial scalar non-Gaussianities in single field inflationary models. We consider models where the inflaton Lagrangian is an arbitrary function of the scalar field and its first derivative, and the sound speed is arbitrary. We find that under reasonable assumptions, the non-Gaussianity is completely determined by 5 parameters. In special limits of the parameter space, one finds distinctive ''shapes'' of the non-Gaussianity. In models with a small sound speed, several of these shapes would become potentially observable in the near future. Different limits of our formulae recover various previously known results.},
doi = {10.2172/881956},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri May 05 00:00:00 EDT 2006},
month = {Fri May 05 00:00:00 EDT 2006}
}

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