Dark Energy versus Modified Gravity

Kunz, Martin and Sapone, Domenico (2007) Dark Energy versus Modified Gravity. Physical Review Letters, 98 (12). pp. 1213011-4. ISSN 0031-9007

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There is now strong observational evidence that the expansion of the Universe is accelerating. The standard explanation invokes an unknown dark energy component. But such scenarios are faced with serious theoretical problems, which has led to increased interest in models where instead general relativity is modified in a way that leads to the observed accelerated expansion. The question then arises whether the two scenarios can be distinguished. Here we show that this may not be so easy, demonstrating explicitly that a generalized dark energy model can match the growth rate of the Dvali-Gabadadze-Porrati model and reproduce the 3+1 dimensional metric perturbations. Cosmological observations are then unable to distinguish the two cases.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Martin Kunz
Date Deposited: 06 Feb 2012 18:45
Last Modified: 02 Jul 2019 20:49
URI: http://sro.sussex.ac.uk/id/eprint/18193

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