CMB Constraint on Radion Evolution in the Brane World Scenario

Details CMB Constraint on Radion Evolution in the Brane World Scenario CMB Constraint on Radion Evolution in the Brane World Scenario

2007-06-04

arxiv.org/abs/0706.0391v2

Phys.Rev.D76:043525,2007

Astronomy and Astrophysics

Astrophysics

7 pages, 6 figures, minor changes of format to conform with PRD format

Scientific paper

10.1103/PhysRevD.76.043525

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, $$, resulting in cosmological variation of the electron mass $m_e$. The formation of Cosmic Microwave Background (CMB) anisotropies is thus affected, causing changes both in the peaks positions and amplitudes in the CMB power spectra. Using the three-year Wilkinson Microwave Anisotropies Probe (WMAP) CMB data, with the Hubble parameter $H_0$ fixed to be the Hubble Space Telescope (HST) result 72 km s$^{-1}$ Mpc$^{-1}$, we obtain a constraint on $\rho$, the ratio of the value of $$ at CMB recombination to its present value, to be [0.97, 1.02].

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