Cosmology on Ultralarge Scales with Intensity Mapping

A new PRL paper from UWCs’, Mário Santos! Get the full article here.

Cosmology on Ultralarge Scales with Intensity Mapping of the Neutral Hydrogen 21 cm Emission: Limits on Primordial Non-Gaussianity

Stefano Camera1,2,*, Mário G. Santos1,2,†, Pedro G. Ferreira3,‡, and Luís Ferramacho1,2
1CENTRA, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais 1, 1049-001 Lisboa, Portugal
2Department of Physics, University of the Western Cape, Bellville 7535, South Africa
3Astrophysics, University of Oxford, DWB, Keble Road, Oxford OX1 3RH, United Kingdom

Received 30 May 2013; revised 30 July 2013; published 22 October 2013



The large-scale structure of the Universe supplies crucial information about the physical processes at play at early times. Unresolved maps of the intensity of 21 cm emission from neutral hydrogen HI at redshifts z≃1–5 are the best hope of accessing the ultralarge-scale information, directly related to the early Universe. A purpose-built HI intensity experiment may be used to detect the large scale effects of primordial non-Gaussianity, placing stringent bounds on different models of inflation. We argue that it may be possible to place tight constraints on the non-Gaussianity parameter fNL, with an error close to σfNL∼1.