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Direct reconstruction of the dark energy scalar-field potential

Li, Chao and Holz, Daniel E. and Cooray, Asantha (2007) Direct reconstruction of the dark energy scalar-field potential. Physical Review D, 75 (10). Art. No. 103503. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:LICprd07b

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Abstract

While the accelerated expansion of the Universe is by now well established, an underlying scalar-field potential possibly responsible for this acceleration remains unconstrained. We present an attempt to reconstruct this potential using recent SN data, under the assumption that the acceleration is driven by a single scalar field. Current approaches to such reconstructions are based upon simple parametric descriptions of either the luminosity distance or the dark energy equation of state. We find that these various approximations lead to a range of derived evolutionary histories of the dark energy equation of state (although there is considerable overlap between the different potential shapes allowed by the data). Instead of these indirect reconstruction schemes, we discuss a technique to determine the potential directly from the data by expressing it in terms of a binned scalar field. We apply this technique to a recent SN data set, and compare the results with model-dependent approaches. In a similar fashion to direct estimates of the dark energy equation of state, we advocate direct reconstruction of the scalar-field potential as a way to minimize prior assumptions on the shape, and thus minimize the introduction of bias in the derived potential.


Item Type:Article
Additional Information:©2007 The American Physical Society (Received 28 November 2006; published 3 May 2007) A.C. and D.E.H. are partially supported by the DOE at LANL through IGPP Grant No. Astro-1603-07. D.E.H. acknowledges support from LANL, and is grateful to the Moore Center for Theoretical Cosmology and Physics at Caltech for its hospitality. C.L. is supported by the Gordon Moore Foundation at Caltech. We thank Dragan Huterer for useful discussions related to this work, and Eric Linder and Robert Caldwell for very detailed comments on an earlier version of the paper.
Group:TAPIR
Record Number:CaltechAUTHORS:LICprd07b
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:LICprd07b
Alternative URL:http://dx.doi.org/10.1103/PhysRevD.75.103503
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8485
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:15 Aug 2007
Last Modified:26 Dec 2012 09:39

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