A Caltech Library Service

Cosmology with the Highly Redshifted 21cm Line

Liu, Adrian and Aguirre, James and Ali-Haimoud, Yacine and Alvarez, Marcelo and Beardsley, Adam and Becker, George and Bowman, Judd and Breysse, Patrick and Bromm, Volker and Bull, Philip and Burns, Jack and Carucci, Isabella P. and Chang, Tzu-Ching and Chen, Xuelei and Chiang, Hsin and Cohn, Joanne and DeBoer, David and Dillon, Joshua and Doré, Olivier and Dvorkin, Cora and Fialkov, Anastasia and Furlanetto, Steven and Gnedin, Nick and Hazelton, Bryna and Hewitt, Jacqueline and Jacobs, Daniel and Karkare, Kirit and Wolt, Marc Klein and Kohn, Saul and Koopmans, Leon and Kovetz, Ely and Plante, Paul La and Lidz, Adam and Ma, Yin-Zhe and Mao, Yi and Masui, Kiyoshi and Mesinger, Andrei and Mirocha, Jordan and Munoz, Julian and Murray, Steven and Newburgh, Laura and Parsons, Aaron and Pober, Jonathan and Pritchard, Jonathan and Saliwanchik, Benjamin and Sievers, Jonathan and Thyagarajan, Nithyanandan and Trac, Hy and Visbal, Eli and Zaldarriaga, Matias (2019) Cosmology with the Highly Redshifted 21cm Line. Astro2020 Science White Paper, . (Unpublished)

[img] PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


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 ΛCDM paradigm at high redshifts.

Item Type:Report or Paper (White Paper)
Related URLs:
URLURL TypeDescription Paper
Doré, Olivier0000-0002-5009-7563
Series Name:Astro2020 Science White Paper
Record Number:CaltechAUTHORS:20190925-101549765
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98850
Deposited By: Tony Diaz
Deposited On:25 Sep 2019 17:22
Last Modified:03 Oct 2019 21:45

Repository Staff Only: item control page