Electromagnetic coupling effects in natural inflation. (28th July 2020)

• Record Type: Journal Article
• Authors: Cho, Hing-Tong; Ng, Kin-Wang
• Is Part Of: Classical and quantum gravity. Volume 37:Number 16(2020:Aug.)
• Publication Date: 2020-07-28
• Subjects: natural inflation -- in-in formalism -- nongaussianity; Quantum gravity -- Periodicals; Gravitation -- Periodicals; Relativity (Physics) -- Periodicals; Space and time -- Periodicals; Periodicals; 521.1
• DOI: 10.1088/1361-6382/ab8600
• Languages: English
• ISSNs: 0264-9381

Abstract

Abstract: In this work we study the effects of the electromagnetic coupling in natural inflation in a systematic manner using the Schwinger–Keldysh formalism. The corresponding influence functional is evaluated in the one-loop level. It can be interpreted as due to a single stochastic force. The equation of motion of the inflaton field is therefore given in the form of a Langevin equation. Lastly, the two-point and the three-point correlation functions of the inflaton field are worked out. They are related to the power spectrum and the nongaussianity of the inflaton field, respectively.