Saini, Tarun Deep ; Raychaudhury, Somak ; Sahni, Varun ; Starobinsky, A. A. (2000) Reconstructing the cosmic equation of state from supernova distances Physical Review Letters, 85 (6). pp. 1162-1165. ISSN 0031-9007
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Official URL: http://prl.aps.org/abstract/PRL/v85/i6/p1162_1
Related URL: http://dx.doi.org/10.1103/PhysRevLett.85.1162
Abstract
Observations of high-redshift supernovae indicate that the Universe is accelerating. Here we present a model-independent method for estimating the form of the potential V(φ) of the scalar field driving this acceleration, and the associated equation of state wφ. Our method is based on a versatile analytical form for the luminosity distance DL, optimized to fit observed distances to distant supernovae and differentiated to yield V(φ) and wφ. Our results favor wφ≃−1 at the present epoch, steadily increasing with redshift. A cosmological constant is consistent with our results.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The American Physical Society. |
| ID Code: | 45619 |
| Deposited On: | 28 Jun 2011 04:39 |
| Last Modified: | 28 Jun 2011 04:39 |
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