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Title: Non-Gaussian enhancements of galactic halo correlations in quasi-single field inflation

Abstract

We consider a quasi-single field inflation model in which the inflaton interacts with a massive scalar field called the isocurvaton. Due to the breaking of time translational invariance by the inflaton background, these interactions induce kinetic mixing between the inflaton and isocurvaton, which is parameterized by a constant μ . We derive analytic formulas for the curvature perturbation two-, three-, four-, five-, and six-point functions explicitly in terms of the external wave vectors in the limit where μ and the mass of the isocurvaton m are both much smaller than H . In previous work, it has been noted that when m/H and μ/H are small, the non-Gaussianities predicted by quasi-single field inflation give rise to long wavelength enhancements of the power spectrum for biased objects (e.g., galactic halos). We review this calculation, and calculate the analogous enhanced contribution to the bispectrum of biased objects. We determine the scale at which these enhanced terms are larger than the Gaussian piece. We also identify the scaling of these enhanced parts to the n -point function of biased objects.

Authors:
 [1];  [2];  [2];  [2]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States); Tsinghua Univ., Beijing (China). Center for Advanced Studies
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Research Org.:
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1454890
Alternate Identifier(s):
OSTI ID: 1501536
Grant/Contract Number:  
SC0011632
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 12; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

An, Haipeng, McAneny, Michael, Ridgway, Alexander K., and Wise, Mark B. Non-Gaussian enhancements of galactic halo correlations in quasi-single field inflation. United States: N. p., 2018. Web. doi:10.1103/physrevd.97.123528.
An, Haipeng, McAneny, Michael, Ridgway, Alexander K., & Wise, Mark B. Non-Gaussian enhancements of galactic halo correlations in quasi-single field inflation. United States. doi:10.1103/physrevd.97.123528.
An, Haipeng, McAneny, Michael, Ridgway, Alexander K., and Wise, Mark B. Tue . "Non-Gaussian enhancements of galactic halo correlations in quasi-single field inflation". United States. doi:10.1103/physrevd.97.123528.
@article{osti_1454890,
title = {Non-Gaussian enhancements of galactic halo correlations in quasi-single field inflation},
author = {An, Haipeng and McAneny, Michael and Ridgway, Alexander K. and Wise, Mark B.},
abstractNote = {We consider a quasi-single field inflation model in which the inflaton interacts with a massive scalar field called the isocurvaton. Due to the breaking of time translational invariance by the inflaton background, these interactions induce kinetic mixing between the inflaton and isocurvaton, which is parameterized by a constant μ . We derive analytic formulas for the curvature perturbation two-, three-, four-, five-, and six-point functions explicitly in terms of the external wave vectors in the limit where μ and the mass of the isocurvaton m are both much smaller than H . In previous work, it has been noted that when m/H and μ/H are small, the non-Gaussianities predicted by quasi-single field inflation give rise to long wavelength enhancements of the power spectrum for biased objects (e.g., galactic halos). We review this calculation, and calculate the analogous enhanced contribution to the bispectrum of biased objects. We determine the scale at which these enhanced terms are larger than the Gaussian piece. We also identify the scaling of these enhanced parts to the n -point function of biased objects.},
doi = {10.1103/physrevd.97.123528},
journal = {Physical Review D},
number = 12,
volume = 97,
place = {United States},
year = {2018},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/physrevd.97.123528

Citation Metrics:
Cited by: 6 works
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