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http://hdl.handle.net/2289/3794
Title: | Estimation of cosmological prameters from neutral hydrogen observations of the post-reionization epoch |
Authors: | Bharadwaj, Somnath Sethi, S.K. Saini, T.D. |
Issue Date: | Apr-2009 |
Publisher: | American Physical Society |
Citation: | Physical Review D, 2009, Vol.79, p083538 |
Abstract: | The emission from neutral hydrogen (HI) clouds in the post-reionization era (z<=6), too faint to be individually detected, is present as a diffuse background in all low frequency radio observations below 1420 MHz. The angular and frequency fluctuations of this radiation (~1 mK) are an important future probe of the large-scale structures in the Universe. We show that such observations are a very effective probe of the background cosmological model and the perturbed Universe. In our study we focus on the possibility of determining the redshift-space distortion parameter beta, coordinate distance rnu, and its derivative with redshift rnu[prime]. Using reasonable estimates for the observational uncertainties and configurations representative of the ongoing and upcoming radio interferometers, we predict parameter estimation at a precision comparable with supernova Ia observations and galaxy redshift surveys, across a wide range in redshift that is only partially accessed by other probes. Future HI observations of the post-reionization era present a new technique, complementing several existing ones, to probe the expansion history and to elucidate the nature of the dark energy. |
Description: | Open Access |
URI: | http://hdl.handle.net/2289/3794 |
ISSN: | 1550-2368(online) 1550-7998 (print) |
Alternative Location: | http://arxiv.org/abs/0809.0363 http://dx.doi.org/10.1103/PhysRevD.79.083538 |
Copyright: | 2009 The American Physical Society |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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2009_PRD_V79_083538.pdf | Open Access | 223.48 kB | Adobe PDF | View/Open |
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