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The emission from neutral hydrogen (HI) clouds in the post-reionization era(z < 6), too faint to be individually detected, is present as a diffusebackground in all low frequency radio observations below 1420 MHz. The angularand frequency fluctuations of this radiation (~ 1 mK) is an important futureprobe of the large scale structures in the Universe. We show that suchobservations are a very effective probe of the background cosmological modeland the perturbed Universe. In our study we focus on the possibility ofdetermining the redshift space distortion parameter, coordinate distance andits derivative with redshift. Using reasonable estimates for the observationaluncertainties and configurations representative of the ongoing and upcomingradio interferometers, we predict parameter estimation at a precisioncomparable with supernova Ia observations and galaxy redshift surveys, across awide range in redshift that is only partially accessed by other probes. FutureHI observations of the post-reionization era present a new technique,complementing several existing one, to probe the expansion history and toelucidate the nature of the dark energy.

Estimation of Cosmological Parameters from HI Observations of Post-reionization Epoch