On the initial condition of inflationary fluctuations
Abstract
It is usually assumed that the inflationary fluctuations start from the BunchDavies (BD) vacuum and the iε prescription is used when interactions are calculated. We show that those assumptions can be verified explicitly by calculating the loop corrections to the inflationary twopoint and threepoint correlation functions. Those loop corrections can be resummed to exponential factors, which suppress nonBD coefficients and behave as the iε factor for the case of the BD initial condition. A new technique of loop chain diagram resummation is developed for this purpose. For the nonBD initial conditions which is setup at finite time and has not fully decayed, explicit correction to the twopoint and threepoint correlation functions are calculated. Especially, nonGaussianity in the folded limit is regularized due to the interactions.
 Authors:

 Department of Physics, The Hong Kong University of Science and Technology,Clear Water Bay, Kowloon, Hong Kong (China)
 Publication Date:
 Sponsoring Org.:
 SCOAP3, CERN, Geneva (Switzerland)
 OSTI Identifier:
 22572065
 Resource Type:
 Journal Article
 Journal Name:
 Journal of Cosmology and Astroparticle Physics
 Additional Journal Information:
 Journal Volume: 2016; Journal Issue: 04; Other Information: PUBLISHERID: JCAP04(2016)041; OAI: oai:repo.scoap3.org:15317; ccby Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 14757516
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CORRECTIONS; CORRELATION FUNCTIONS; COSMOLOGICAL INFLATION; COSMOLOGY; FLUCTUATIONS; INFLATIONARY UNIVERSE; PERTURBATION THEORY
Citation Formats
Jiang, Hongliang, Wang, Yi, and Zhou, Siyi. On the initial condition of inflationary fluctuations. United States: N. p., 2016.
Web. doi:10.1088/14757516/2016/04/041.
Jiang, Hongliang, Wang, Yi, & Zhou, Siyi. On the initial condition of inflationary fluctuations. United States. doi:10.1088/14757516/2016/04/041.
Jiang, Hongliang, Wang, Yi, and Zhou, Siyi. Thu .
"On the initial condition of inflationary fluctuations". United States. doi:10.1088/14757516/2016/04/041.
@article{osti_22572065,
title = {On the initial condition of inflationary fluctuations},
author = {Jiang, Hongliang and Wang, Yi and Zhou, Siyi},
abstractNote = {It is usually assumed that the inflationary fluctuations start from the BunchDavies (BD) vacuum and the iε prescription is used when interactions are calculated. We show that those assumptions can be verified explicitly by calculating the loop corrections to the inflationary twopoint and threepoint correlation functions. Those loop corrections can be resummed to exponential factors, which suppress nonBD coefficients and behave as the iε factor for the case of the BD initial condition. A new technique of loop chain diagram resummation is developed for this purpose. For the nonBD initial conditions which is setup at finite time and has not fully decayed, explicit correction to the twopoint and threepoint correlation functions are calculated. Especially, nonGaussianity in the folded limit is regularized due to the interactions.},
doi = {10.1088/14757516/2016/04/041},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {14757516},
number = 04,
volume = 2016,
place = {United States},
year = {2016},
month = {4}
}