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Intensity mapping of the HI brightness temperature provides a unique way oftracing large-scale structures of the Universe up to the largest possiblescales. This is achieved by using a low angular resolution radio telescopes todetect emission line from cosmic neutral Hydrogen in the post-reionizationUniverse. We use general relativistic perturbation theory techniques to derivefor the first time the full expression for the HI brightness temperature up tothird order in perturbation theory without making any plane-parallelapproximation. We use this result and the renormalization prescription forbiased tracers to study the impact of nonlinear effects on the power spectrumof HI brightness temperature both in real and redshift space. We show how modecoupling at nonlinear order due to nonlinear bias parameters and redshift spacedistortion terms modulate the power spectrum on large scales. The large scalemodulation may be understood to be due to the effective bias parameter andeffective shot noise.

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