Imprint of non-linear effects on HI intensity mapping on large scales

Abstract

Intensity mapping of the HI brightness temperature provides a unique way of tracing large-scale structures of the Universe up to the largest possible scales. This is achieved by using a low angular resolution radio telescopes to detect emission line from cosmic neutral Hydrogen in the post-reionization Universe. We use general relativistic perturbation theory techniques to derive for the first time the full expression for the HI brightness temperature up to third order in perturbation theory without making any plane-parallel approximation. We use this result and the renormalization prescription for biased tracers to study the impact of nonlinear effects on the power spectrum of HI brightness temperature both in real and redshift space. We show how mode coupling at nonlinear order due to nonlinear bias parameters and redshift space distortion terms modulate the power spectrum on large scales. The large scale modulation may be understood to be due to the effective bias parameter and effective shot noise.

15 pages, 8 figures. Matches published version

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Cited by in corpus (10)

• High-redshift post-reionization cosmology with 21cm intensity mapping
• Detecting the relativistic bispectrum in 21cm intensity maps
• Modelling the post-reionization neutral hydrogen ($\mathrm{HI}$) 21-cm bispectrum
• Redshift space distortions of the {\rm HI} 21-cm intensity mapping signal due to the internal motions within galaxies
• Redshift Space Distortion of 21cm line at 1<z<5 with Cosmological Hydrodynamic Simulations
• Optimal computation of anisotropic galaxy three point correlation function multipoles using 2DFFTLOG formalism
• Testing the equivalence principle on cosmological scales using the odd multipoles of galaxy cross-power spectrum and bispectrum
• The galaxy bias at second order in general relativity with Non-Gaussian initial conditions
• The effect of finite halo size on the clustering of neutral hydrogen
• Nonlinear phenomena in general relativity