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http://hdl.handle.net/2289/3794Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Bharadwaj, Somnath | - |
| dc.contributor.author | Sethi, S.K. | - |
| dc.contributor.author | Saini, T.D. | - |
| dc.date.accessioned | 2009-07-15T09:58:32Z | - |
| dc.date.available | 2009-07-15T09:58:32Z | - |
| dc.date.issued | 2009-04 | - |
| dc.identifier.citation | Physical Review D, 2009, Vol.79, p083538 | en |
| dc.identifier.issn | 1550-2368(online) | - |
| dc.identifier.issn | 1550-7998 (print) | - |
| dc.identifier.uri | http://hdl.handle.net/2289/3794 | - |
| dc.description | Open Access | en |
| dc.description.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. | en |
| dc.language.iso | en | en |
| dc.publisher | American Physical Society | en |
| dc.relation.uri | http://arxiv.org/abs/0809.0363 | en |
| dc.relation.uri | http://dx.doi.org/10.1103/PhysRevD.79.083538 | en |
| dc.rights | 2009 The American Physical Society | en |
| dc.title | Estimation of cosmological prameters from neutral hydrogen observations of the post-reionization epoch | en |
| dc.type | Article | en |
| Appears in Collections: | Research Papers (A&A) | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2009_PRD_V79_083538.pdf | Open Access | 223.48 kB | Adobe PDF | View/Open |
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