The Lyman-α power spectrum—CMB lensing convergence cross-correlation

Journal Article · Thu Jan 11 04:00:00 UTC 2018 · Journal of Cosmology and Astroparticle Physics

DOI: https://doi.org/10.1088/1475-7516/2018/01/012 · OSTI ID:1426439

Chiang, Chi-Ting ^[1]; Slosar, Anže ^[2]

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1. Stony Brook Univ., NY (United States)
2. Brookhaven National Lab. (BNL), Upton, NY (United States)

We investigate the three-point correlation between the Lyman-α forest and the CMB weak lensing (δ_Fδ_FΚ) expressed as the cross-correlation 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 non-standard systematic term coming from mis-estimation of the mean flux over the finite length of Lyman-α skewers. We numerically calculate the angular cross-power spectrum and discuss its features. We integrate it into zero-lag 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 Lyman-α forest power spectrum to the long-wavelength density perturbations.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Grant/Contract Number: SC0012704
• OSTI ID: 1426439
• Report Number(s): BNL--203334-2018-JAAM
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 01 Vol. 2018; ISSN 1475-7516
• Publisher: Institute of Physics (IOP)Copyright Statement
• Country of Publication: United States
• Language: English