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First detection of cosmic microwave background lensing and Lyman-α forest bispectrum

Cyrille Doux, Emmanuel Schaan, Eric Aubourg, Ken Ganga, Khee-Gan Lee, David N. Spergel, and Julien Tréguer
Phys. Rev. D 94, 103506 – Published 9 November 2016
Physics logo See Synopsis: Seeing Dark Matter Through the Clouds

Abstract

We present the first detection of a correlation between the Lyman-α forest and cosmic microwave background gravitational lensing. For each Lyman-α forest in SDSS-III/BOSS DR12, we correlate the one-dimensional power spectrum with the cosmic microwave background lensing convergence on the same line of sight from Planck. This measurement constitutes a position-dependent power spectrum, or a squeezed bispectrum, and quantifies the nonlinear response of the Lyman-α forest power spectrum to a large-scale overdensity. The signal is measured at 5σ and is consistent with the expectation of the standard ΛCDM cosmological model. We measure the linear bias of the Lyman-α forest with respect to the dark matter distribution and constrain a combination of nonlinear terms including the nonlinear bias. This new observable provides a consistency check for the Lyman-α forest as a large-scale structure probe and tests our understanding of the relation between intergalactic gas and dark matter. In the future, it could be used to test hydrodynamical simulations and calibrate the relation between the Lyman-α forest and dark matter.

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  • Received 25 July 2016

DOI:https://doi.org/10.1103/PhysRevD.94.103506

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Synopsis

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Seeing Dark Matter Through the Clouds

Published 9 November 2016

A correlation between the cosmic microwave background and hydrogen absorption lines may reveal a connection between dark matter and intergalactic gas clouds.

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Authors & Affiliations

Cyrille Doux1,*, Emmanuel Schaan2, Eric Aubourg1, Ken Ganga1, Khee-Gan Lee3, David N. Spergel2, and Julien Tréguer1

  • 1AstroParticule et Cosmologie, Université Paris Diderot, CNRS, CEA, Observatoire de Paris, Sorbonne Paris Cité Bâtiment Condorcet, 10, rue Alice Domon et Léonie Duquet, F-75205 Paris Cedex 13, France
  • 2Department of Astrophysical Sciences, Peyton Hall, Princeton University, Princeton, New Jersey 08544, USA
  • 3Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA

  • *cdoux@apc.in2p3.fr.

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Issue

Vol. 94, Iss. 10 — 15 November 2016

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