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Title: Stochastic bias from loops of massive particles during inflation

Abstract

Primordial non-Gaussianities enhanced at small wavevectors can induce a power spectrum of the galaxy overdensity that differs greatly from that of the matter overdensity at large length scales. In previous work, it was shown that “squeezed” three-point and “collapsed” four-point functions of the curvature perturbation ζ can generate these non-Gaussianities and give rise to so-called scale-dependent and stochastic bias in the galaxy overdensity power spectrum. We explore a third way to generate non-Gaussianities enhanced at small wavevectors: the infrared behavior of quantum loop contributions to the four-point correlations of ζ. We show that these loop effects can give the largest contributions to the four-point function of ζ in the collapsed limit and be observable in the context of quasi-single field inflation.

Authors:
; ; ;
Publication Date:
Research Org.:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1464835
Alternate Identifier(s):
OSTI ID: 1600497
Grant/Contract Number:  
SC0011632
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 785 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

McAneny, Michael, Ridgway, Alexander K., Solon, Mikhail P., and Wise, Mark B. Stochastic bias from loops of massive particles during inflation. Netherlands: N. p., 2018. Web. doi:10.1016/j.physletb.2018.06.026.
McAneny, Michael, Ridgway, Alexander K., Solon, Mikhail P., & Wise, Mark B. Stochastic bias from loops of massive particles during inflation. Netherlands. doi:10.1016/j.physletb.2018.06.026.
McAneny, Michael, Ridgway, Alexander K., Solon, Mikhail P., and Wise, Mark B. Mon . "Stochastic bias from loops of massive particles during inflation". Netherlands. doi:10.1016/j.physletb.2018.06.026.
@article{osti_1464835,
title = {Stochastic bias from loops of massive particles during inflation},
author = {McAneny, Michael and Ridgway, Alexander K. and Solon, Mikhail P. and Wise, Mark B.},
abstractNote = {Primordial non-Gaussianities enhanced at small wavevectors can induce a power spectrum of the galaxy overdensity that differs greatly from that of the matter overdensity at large length scales. In previous work, it was shown that “squeezed” three-point and “collapsed” four-point functions of the curvature perturbation ζ can generate these non-Gaussianities and give rise to so-called scale-dependent and stochastic bias in the galaxy overdensity power spectrum. We explore a third way to generate non-Gaussianities enhanced at small wavevectors: the infrared behavior of quantum loop contributions to the four-point correlations of ζ. We show that these loop effects can give the largest contributions to the four-point function of ζ in the collapsed limit and be observable in the context of quasi-single field inflation.},
doi = {10.1016/j.physletb.2018.06.026},
journal = {Physics Letters B},
number = C,
volume = 785,
place = {Netherlands},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2018.06.026

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Cited by: 2 works
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Works referencing / citing this record:

The Hunt for Primordial Interactions in the Large-Scale Structures of the Universe
journal, August 2019


New shapes of primordial non-Gaussianity from quasi-single field inflation with multiple isocurvatons
journal, August 2019