High-redshift 21cm Cosmology in Canada. (arXiv:1910.03153v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Liu_A/0/1/0/all/0/1">Adrian Liu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chiang_H/0/1/0/all/0/1">H. Cynthia Chiang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Crites_A/0/1/0/all/0/1">Abigail Crites</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sievers_J/0/1/0/all/0/1">Jonathan Sievers</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hlozek_R/0/1/0/all/0/1">Renée Hložek</a>
In the next few years, the 21cm line will enable direct observations of the
Dark Ages, Cosmic Dawn, and Reionization, which represent previously unexplored
periods in our cosmic history. With a combination of sky-averaged global signal
measurements and spatial mapping surveys, the possible science return is
enormous. This potentially includes (but is not limited to) constraints on
first-generation galaxies (such as their typical masses and luminosities),
constraints on cosmological parameters, a measurement of the Hubble parameter
at z~15 to 20, the elimination of the optical depth nuisance parameter in the
CMB, and searches for exotic phenomena such as baryon-dark matter couplings. To
enable continued Canadian leadership in these science opportunities, we
recommend 1) continued investments in 21cm experiments at all redshifts, 2)
detailed analysis efforts of current data to overcome systematic effects, 3)
new investments in preliminary experiments to explore the truly low-frequency
sky as a stepping stone towards the Dark Ages, 4) new investments in
line-intensity mapping experiments beyond the 21cm line, 5) continued theory
support for 21cm cosmology, and 6) continued participation and knowledge
transfer to next-generation international efforts such as the Square Kilometre
Array.
In the next few years, the 21cm line will enable direct observations of the
Dark Ages, Cosmic Dawn, and Reionization, which represent previously unexplored
periods in our cosmic history. With a combination of sky-averaged global signal
measurements and spatial mapping surveys, the possible science return is
enormous. This potentially includes (but is not limited to) constraints on
first-generation galaxies (such as their typical masses and luminosities),
constraints on cosmological parameters, a measurement of the Hubble parameter
at z~15 to 20, the elimination of the optical depth nuisance parameter in the
CMB, and searches for exotic phenomena such as baryon-dark matter couplings. To
enable continued Canadian leadership in these science opportunities, we
recommend 1) continued investments in 21cm experiments at all redshifts, 2)
detailed analysis efforts of current data to overcome systematic effects, 3)
new investments in preliminary experiments to explore the truly low-frequency
sky as a stepping stone towards the Dark Ages, 4) new investments in
line-intensity mapping experiments beyond the 21cm line, 5) continued theory
support for 21cm cosmology, and 6) continued participation and knowledge
transfer to next-generation international efforts such as the Square Kilometre
Array.
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