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Measuring the growth of structure with intensity mapping surveys

2019; Institute of Physics; Volume: 2019; Issue: 06 Linguagem: Inglês

10.1088/1475-7516/2019/06/025

1475-7516

Emanuele Castorina, Martin White,

Astrophysics and Cosmic Phenomena

Line intensity mapping offers a new avenue for constraining cosmological parameters in the high redshift Universe. However measurements of the growth of structure, a sensitive probe of gravity, are affected by a well known degeneracy with astrophysical parameters, encoded in the mean brightness temperature of the specific line. In this work we show how to break this degeneracy, to a level that could allow constraints of the amplitude of cosmological fluctuations at the percent level, using information in the mildly non-linear regime of structure formation as described by Lagrangian Perturbation Theory. We focus on the 21-cm line with forecasts for HIRAX and the proposed Stage II experiment as illustrations.