TY - JOUR
T1 - Consistency relation and inflaton field redefinition in the δN formalism
AU - Domènech, Guillem
AU - Gong, Jinn Ouk
AU - Sasaki, Misao
N1 - Funding Information:
We would like to thank Joey Fedrow, Antonio de Felice, Godfrey Leung, Atsushi Naruko, Ryo Saito, Yuki Sakakihara and Takahiro Tanaka for useful comments and discussions. JG acknowledges support from the Korea Ministry of Education, Science and Technology, Gyeongsangbuk-Do and Pohang City for Independent Junior Research Groups at the Asia Pacific Center for Theoretical Physics. This work is also supported in part by MEXT KAKENHI Grant Number 15H05888, by a Starting Grant through the Basic Science Research Program of the National Research Foundation of Korea (2013R1A1A1006701) and by a TJ Park Science Fellowship of POSCO TJ Park Foundation.
Publisher Copyright:
© 2017 The Author(s)
PY - 2017/6/10
Y1 - 2017/6/10
N2 - We compute for general single-field inflation the intrinsic non-Gaussianity due to the self-interactions of the inflaton field in the squeezed limit. We recover the consistency relation in the context of the δN formalism, and argue that there is a particular field redefinition that makes the intrinsic non-Gaussianity vanishing, thus improving the estimate of the local non-Gaussianity using the δN formalism.
AB - We compute for general single-field inflation the intrinsic non-Gaussianity due to the self-interactions of the inflaton field in the squeezed limit. We recover the consistency relation in the context of the δN formalism, and argue that there is a particular field redefinition that makes the intrinsic non-Gaussianity vanishing, thus improving the estimate of the local non-Gaussianity using the δN formalism.
UR - http://www.scopus.com/inward/record.url?scp=85026290162&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2017.04.014
DO - 10.1016/j.physletb.2017.04.014
M3 - Article
AN - SCOPUS:85026290162
SN - 0370-2693
VL - 769
SP - 413
EP - 417
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ER -