Measuring the growth of structure with intensity mapping surveys

Abstract

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.

12 pages, 7 figures, matches version accepted by journal

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Cited by in corpus (23)

• HI constraints from the cross-correlation of eBOSS galaxies and Green Bank Telescope intensity maps
• Line-Intensity Mapping: Theory Review
• Neutrino Properties with Ground-Based Millimeter-Wavelength Line Intensity Mapping
• Astrophysics & Cosmology from Line Intensity Mapping vs Galaxy Surveys
• Multipole expansion for HI intensity mapping experiments: simulations and modelling
• Power spectrum multipole expansion for HI intensity mapping experiments: unbiased parameter estimation
• The HI intensity mapping bispectrum including observational effects
• Redshift space distortions of the {\rm HI} 21-cm intensity mapping signal due to the internal motions within galaxies
• Constraining the growth rate by combining multiple future surveys
• Optical depth to reionization from perturbative 21cm clustering
• Interferometric HI intensity mapping: perturbation theory predictions and foreground removal effects
• Cosmology at high redshift -- a probe of fundamental physics
• Unveiling the Universe with Emerging Cosmological Probes
• Baryon acoustic oscillations from HI intensity mapping: the importance of cross-correlations in the monopole and quadrupole
• Towards Accurate Modeling of Line-Intensity Mapping One-Point Statistics: Including Extended Profiles
• A wide-angle formulation of foreground filters for HI intensity mapping
• Reionization relics in the cross-correlation between the Ly$\alpha$ forest and 21 cm intensity mapping in the post-reionization era
• Forecasts on Interacting Dark Energy from 21-cm Angular Power Spectrum with BINGO and SKA observations
• Influence of the deviation of the matter power spectrum at small scales on the global 21-cm signal at cosmic dawn
• Constraining the growth rate on linear scales by combining SKAO and DESI surveys
• An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment
• Streaming Velocity Effects on the Post-reionization 21 cm Baryon Acoustic Oscillation Signal
• Testing the growth of cosmic structures during the Dark Ages