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Cosmological constraints on DGP braneworld gravity with brane tension


Lombriser, L; Hu, W; Fang, W; Seljak, U (2009). Cosmological constraints on DGP braneworld gravity with brane tension. Physical Review D, 80(6): 063536.

Abstract

We perform a Markov chain Monte Carlo analysis of the self-accelerating and normal branch of Dvali-Gabadadze-Porrati braneworld gravity. By adopting a parametrized post-Friedmann description of gravity, we utilize all of the cosmic microwave background data, including the largest scales, and its correlation with galaxies in addition to the geometrical constraints from supernovae distances and the Hubble constant. We find that on both branches brane tension or a cosmological constant is required at high significance with no evidence for the unique Dvali-Gabadadze-Porrati modifications. The crossover scale must therefore be substantially greater than the Hubble scale H0rc>3 and 3.5 at the 95% C.L. with and without uncertainties from spatial curvature. With spatial curvature, the limit from the normal branch is substantially assisted by the galaxy cross correlation which highlights its importance in constraining infrared modifications to gravity.

Abstract

We perform a Markov chain Monte Carlo analysis of the self-accelerating and normal branch of Dvali-Gabadadze-Porrati braneworld gravity. By adopting a parametrized post-Friedmann description of gravity, we utilize all of the cosmic microwave background data, including the largest scales, and its correlation with galaxies in addition to the geometrical constraints from supernovae distances and the Hubble constant. We find that on both branches brane tension or a cosmological constant is required at high significance with no evidence for the unique Dvali-Gabadadze-Porrati modifications. The crossover scale must therefore be substantially greater than the Hubble scale H0rc>3 and 3.5 at the 95% C.L. with and without uncertainties from spatial curvature. With spatial curvature, the limit from the normal branch is substantially assisted by the galaxy cross correlation which highlights its importance in constraining infrared modifications to gravity.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:September 2009
Deposited On:27 Feb 2010 12:47
Last Modified:05 Apr 2016 13:56
Publisher:American Physical Society
ISSN:1550-2368
Funders:Swiss National Foundation [200021-116696/1], WCU [R32-2008000-10130-0], University of Chicago through Grants NSF [PHY-0114422, PHY-0551142], U.S. Department of Energy [DE-FG02-90ER-40560, DE-AC02-98CH10886] , David and Lucile Packard Foundation
Publisher DOI:https://doi.org/10.1103/PhysRevD.80.063536
Related URLs:http://arxiv.org/abs/0905.1112

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Content: Accepted Version
Filetype: PDF (Accepted manuscript, Version 1)
Size: 452kB