Cosmology with the Highly Redshifted 21cm Line

In addition to being a probe of Cosmic Dawn and Epoch of Reionization astrophysics, the 21cm line at \(z>6\) is also a powerful way to constrain cosmology. Its power derives from several unique capabilities. First, the 21cm line is sensitive to energy injections into the intergalactic medium at h...

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Published in:arXiv.org 2019-03
Main Authors: Liu, Adrian, Aguirre, James, Ali-Haimoud, Yacine, Alvarez, Marcelo, Beardsley, Adam, Becker, George, Bowman, Judd, Breysse, Patrick, Bromm, Volker, Bull, Philip, Burns, Jack, Carucci, Isabella P, Chang, Tzu-Ching, Chen, Xuelei, Chiang, Hsin, Cohn, Joanne, DeBoer, David, Dillon, Joshua, Doré, Olivier, Dvorkin, Cora, Fialkov, Anastasia, Furlanetto, Steven, Gnedin, Nick, Hazelton, Bryna, Hewitt, Jacqueline, Jacobs, Daniel, Karkare, Kirit, Marc Klein Wolt, Kohn, Saul, Koopmans, Leon, Kovetz, Ely, Paul La Plante, Lidz, Adam, Yin-Zhe, Ma, Mao, Yi, Masui, Kiyoshi, Mesinger, Andrei, Jordan Mirocha, Munoz, Julian, Murray, Steven, Newburgh, Laura, Parsons, Aaron, Pober, Jonathan, Pritchard, Jonathan, Saliwanchik, Benjamin, Sievers, Jonathan, Thyagarajan, Nithyanandan, Trac, Hy, Visbal, Eli, Zaldarriaga, Matias
Format: Article
Language:English
Subjects:
Astrophysics
Cosmology
Dark matter
Intergalactic media
Ionization
Red shift
Online Access:Get full text
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Summary:In addition to being a probe of Cosmic Dawn and Epoch of Reionization astrophysics, the 21cm line at \(z>6\) is also a powerful way to constrain cosmology. Its power derives from several unique capabilities. First, the 21cm line is sensitive to energy injections into the intergalactic medium at high redshifts. It also increases the number of measurable modes compared to existing cosmological probes by orders of magnitude. Many of these modes are on smaller scales than are accessible via the CMB, and moreover have the advantage of being firmly in the linear regime (making them easy to model theoretically). Finally, the 21cm line provides access to redshifts prior to the formation of luminous objects. Together, these features of 21cm cosmology at \(z>6\) provide multiple pathways toward precise cosmological constraints. These include the "marginalizing out" of astrophysical effects, the utilization of redshift space distortions, the breaking of CMB degeneracies, the identification of signatures of relative velocities between baryons and dark matter, and the discovery of unexpected signs of physics beyond the \(\Lambda\)CDM paradigm at high redshifts.
ISSN:2331-8422