CMB Constraint on Radion Evolution in the Brane World Scenario
arXiv:0706.0391 · doi:10.1103/PhysRevD.76.043525
Abstract
In many versions of brane model, the modulus field of extra dimensions, the radion, could have cosmological evolution, which induces variation of the Higgs vacuum expectation value, , resulting in cosmological variation of the electron mass . The formation of Cosmic Microwave Background (CMB) anisotropies is thus affected, causing changes both in the peaks positions and amplitudes in the CMB power spectra. Using the three-year Wilkinson Microwave Anisotropies Probe (WMAP) CMB data, with the Hubble parameter fixed to be the Hubble Space Telescope (HST) result 72 km s Mpc, we obtain a constraint on , the ratio of the value of at CMB recombination to its present value, to be [0.97, 1.02].
7 pages, 6 figures, minor changes of format to conform with PRD format
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