Journal
PHYSICAL REVIEW D
Volume 80, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.80.063536
Keywords
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Funding
- 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
- Ministry of Education, Science & Technology (MoST), Republic of Korea [R32-2008-000-10130-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 H(0)r(c) > 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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