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Stochastic Bias from Loops of Massive Particles During Inflation

McAneny, Michael and Ridgway, Alexander K. and Solon, Mikhail P. and Wise, Mark B. (2018) Stochastic Bias from Loops of Massive Particles During Inflation. Physics Letters B, 785 . pp. 332-337. ISSN 0370-2693. doi:10.1016/j.physletb.2018.06.026.

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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.

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Alternate Title:Loop-Induced Stochastic Bias at Small Wavevectors
Additional Information:© 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( Funded by SCOAP3. Received 3 January 2018, Revised 8 June 2018, Accepted 9 June 2018, Available online 15 June 2018. This work was supported by the DOE Grant DE-SC0011632 and by the Walter Burke Institute for Theoretical Physics.
Group:Walter Burke Institute for Theoretical Physics
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Department of Energy (DOE)DE-SC0011632
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
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Record Number:CaltechAUTHORS:20180109-161940287
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Official Citation:Michael McAneny, Alexander K. Ridgway, Mikhail P. Solon, Mark B. Wise, Stochastic bias from loops of massive particles during inflation, Physics Letters B, Volume 785, 2018, Pages 332-337, ISSN 0370-2693, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84213
Deposited By: Joy Painter
Deposited On:10 Jan 2018 00:25
Last Modified:15 Nov 2021 20:17

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