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Title: How likely are constituent quanta to initiate inflation?

Abstract

We propose an intuitive framework for studying the problem of initial conditions in slow-roll inflation. In particular, we consider a universe at high, but sub-Planckian energy density and analyze the circumstances under which it is plausible for it to become dominated by inflated patches at late times, without appealing to the idea of self-reproduction. Our approach is based on defining a prior probability distribution for the constituent quanta of the pre-inflationary universe. To test the idea that inflation can begin under very generic circumstances, we make specific – yet quite general and well grounded – assumptions on the prior distribution. As a result, we are led to the conclusion that the probability for a given region to ignite inflation at sub-Planckian densities is extremely small. Furthermore, if one chooses to use the enormous volume factor that inflation yields as an appropriate measure, we find that the regions of the universe which started inflating at densities below the self-reproductive threshold nevertheless occupy a negligible physical volume in the present universe as compared to those domains that have never inflated.

Authors:
;
Publication Date:
Research Org.:
Univ. of Pennsylvania, Philadelphia, PA (United States); University of Pennsylvania
Sponsoring Org.:
USDOE
OSTI Identifier:
1209989
Alternate Identifier(s):
OSTI ID: 1239315; OSTI ID: 1438008
Grant/Contract Number:  
FG02-95ER40893
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 749 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Berezhiani, Lasha, and Trodden, Mark. How likely are constituent quanta to initiate inflation?. Netherlands: N. p., 2015. Web. doi:10.1016/j.physletb.2015.08.007.
Berezhiani, Lasha, & Trodden, Mark. How likely are constituent quanta to initiate inflation?. Netherlands. doi:10.1016/j.physletb.2015.08.007.
Berezhiani, Lasha, and Trodden, Mark. Thu . "How likely are constituent quanta to initiate inflation?". Netherlands. doi:10.1016/j.physletb.2015.08.007.
@article{osti_1209989,
title = {How likely are constituent quanta to initiate inflation?},
author = {Berezhiani, Lasha and Trodden, Mark},
abstractNote = {We propose an intuitive framework for studying the problem of initial conditions in slow-roll inflation. In particular, we consider a universe at high, but sub-Planckian energy density and analyze the circumstances under which it is plausible for it to become dominated by inflated patches at late times, without appealing to the idea of self-reproduction. Our approach is based on defining a prior probability distribution for the constituent quanta of the pre-inflationary universe. To test the idea that inflation can begin under very generic circumstances, we make specific – yet quite general and well grounded – assumptions on the prior distribution. As a result, we are led to the conclusion that the probability for a given region to ignite inflation at sub-Planckian densities is extremely small. Furthermore, if one chooses to use the enormous volume factor that inflation yields as an appropriate measure, we find that the regions of the universe which started inflating at densities below the self-reproductive threshold nevertheless occupy a negligible physical volume in the present universe as compared to those domains that have never inflated.},
doi = {10.1016/j.physletb.2015.08.007},
journal = {Physics Letters B},
number = C,
volume = 749,
place = {Netherlands},
year = {2015},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2015.08.007

Citation Metrics:
Cited by: 7 works
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Works referencing / citing this record:

Bouncing Cosmologies: Progress and Problems
journal, February 2017


Implications of Planck2015 for inflationary, ekpyrotic and anamorphic bouncing cosmologies
journal, January 2016


Robustness of inflation to inhomogeneous initial conditions
journal, September 2017

  • Clough, Katy; Lim, Eugene A.; DiNunno, Brandon S.
  • Journal of Cosmology and Astroparticle Physics, Vol. 2017, Issue 09
  • DOI: 10.1088/1475-7516/2017/09/025

Robustness of inflation to large tensor perturbations
journal, May 2018

  • Clough, Katy; Flauger, Raphael; Lim, Eugene A.
  • Journal of Cosmology and Astroparticle Physics, Vol. 2018, Issue 05
  • DOI: 10.1088/1475-7516/2018/05/065

Initial conditions for inflation — A short review
journal, January 2017