CMB constraint on radion evolution in the brane world scenario
- Department of Physics and Institute of Theoretical Physics, Chinese University of Hong Kong, Hong Kong (China)
In many versions of the brane model, the modulus field of extra dimensions, the radion, could have cosmological evolution, which induces a variation of the Higgs vacuum expectation value, <H>, resulting in a cosmological variation of the electron mass m{sub e}. The formation of cosmic microwave background (CMB) anisotropies is thus affected, causing changes both in the peak positions and amplitudes in the CMB power spectra. Using the three-year Wilkinson Microwave Anisotropy Probe (WMAP) CMB data, with the Hubble parameter H{sub 0} fixed to be the Hubble Space Telescope (HST) result 72 km s{sup -1} Mpc{sup -1}, we obtain a constraint on {rho}, the ratio of the value of <H> at CMB recombination to its present value, to be [0.97, 1.02].
- OSTI ID:
- 21027590
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 76, Issue 4; Other Information: DOI: 10.1103/PhysRevD.76.043525; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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