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21cm Cosmology

Published online by Cambridge University Press:  01 July 2015

Mario G. Santos ,
David Alonso ,
Philip Bull ,
Stefano Camera  and
Pedro G. Ferreira
Mario G. Santos
Affiliation:
Department of Physics, University of Western Cape, Cape Town 7535, South Africa SKA SA, 3rd Floor, The Park, Park Road, Pinelands, 7405, South Africa email: mgrsantos@uwc.ac.za CENTRA, Instituto Superior Técnico, Universidade de Lisboa, Portugal
David Alonso
Affiliation:
Astrophysics, University of Oxford, DWB, Keble Road, Oxford OX1 3RH, UK
Philip Bull
Affiliation:
Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, N-0315 Oslo, Norway
Stefano Camera
Affiliation:
Department of Physics, University of Western Cape, Cape Town 7535, South Africa CENTRA, Instituto Superior Técnico, Universidade de Lisboa, Portugal
Pedro G. Ferreira
Affiliation:
Astrophysics, University of Oxford, DWB, Keble Road, Oxford OX1 3RH, UK
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Abstract

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A new generation of radio telescopes with unprecedented capabilities for astronomy and fundamental physics will be in operation over the next few years. With high sensitivities and large fields of view, they are ideal for cosmological applications. We discuss their uses for cosmology focusing on the observational technique of HI intensity mapping, in particular at low redshifts (z < 4). This novel observational window promises to bring new insights for cosmology, in particular on ultra-large scales and at a redshift range that can go beyond the dark energy domination epoch. In terms of standard constraints on the dark energy equation of state, telescopes such as Phase I of the SKA should be able to obtain constrains about as well as a future galaxy redshift surveys. Statistical techniques to deal with foregrounds and calibration issues, as well as possible systematics are also discussed.

Keywords

instrumentation: interferometersmethods: data analysiscosmology: observations(cosmology:) diffuse radiation(cosmology:) large-scale structure of universeradio lines: galaxies

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