The Lymanα power spectrum—CMB lensing convergence crosscorrelation
Abstract
We investigate the threepoint correlation between the Lymanα forest and the CMB weak lensing (δ _{F}δ _{F}Κ) expressed as the crosscorrelation between the CMB weak lensing field and local variations in the forest power spectrum. In addition to the standard gravitational bispectrum term, we note the existence of a nonstandard systematic term coming from misestimation of the mean flux over the finite length of Lymanα skewers. We numerically calculate the angular crosspower spectrum and discuss its features. We integrate it into zerolag correlation function and compare our predictions with recent results by Doux et al.. We nd that our predictions are statistically consistent with the measurement, and including the systematic term improves the agreement with the measurement. We comment on the implication of the response of the Lymanα forest power spectrum to the longwavelength density perturbations.
 Authors:

 Stony Brook Univ., NY (United States)
 Brookhaven National Lab. (BNL), Upton, NY (United States)
 Publication Date:
 Research Org.:
 Brookhaven National Lab. (BNL), Upton, NY (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), High Energy Physics (HEP) (SC25)
 OSTI Identifier:
 1426439
 Report Number(s):
 BNL2033342018JAAM
Journal ID: ISSN 14757516; TRN: US1802281
 Grant/Contract Number:
 SC0012704
 Resource Type:
 Journal Article: Accepted Manuscript
 Journal Name:
 Journal of Cosmology and Astroparticle Physics
 Additional Journal Information:
 Journal Volume: 2018; Journal Issue: 01; Journal ID: ISSN 14757516
 Publisher:
 Institute of Physics (IOP)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Chiang, ChiTing, and Slosar, Anže. The Lymanα power spectrum—CMB lensing convergence crosscorrelation. United States: N. p., 2018.
Web. doi:10.1088/14757516/2018/01/012.
Chiang, ChiTing, & Slosar, Anže. The Lymanα power spectrum—CMB lensing convergence crosscorrelation. United States. doi:10.1088/14757516/2018/01/012.
Chiang, ChiTing, and Slosar, Anže. Thu .
"The Lymanα power spectrum—CMB lensing convergence crosscorrelation". United States. doi:10.1088/14757516/2018/01/012. https://www.osti.gov/servlets/purl/1426439.
@article{osti_1426439,
title = {The Lymanα power spectrum—CMB lensing convergence crosscorrelation},
author = {Chiang, ChiTing and Slosar, Anže},
abstractNote = {We investigate the threepoint correlation between the Lymanα forest and the CMB weak lensing (δFδFΚ) expressed as the crosscorrelation between the CMB weak lensing field and local variations in the forest power spectrum. In addition to the standard gravitational bispectrum term, we note the existence of a nonstandard systematic term coming from misestimation of the mean flux over the finite length of Lymanα skewers. We numerically calculate the angular crosspower spectrum and discuss its features. We integrate it into zerolag correlation function and compare our predictions with recent results by Doux et al.. We nd that our predictions are statistically consistent with the measurement, and including the systematic term improves the agreement with the measurement. We comment on the implication of the response of the Lymanα forest power spectrum to the longwavelength density perturbations.},
doi = {10.1088/14757516/2018/01/012},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {14757516},
number = 01,
volume = 2018,
place = {United States},
year = {2018},
month = {1}
}
Web of Science
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