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arXiv:0706.0391 (astro-ph)
[Submitted on 4 Jun 2007 (v1), last revised 29 Aug 2007 (this version, v2)]

Title:CMB Constraint on Radion Evolution in the Brane World Scenario

Authors:K. C. Chan, M.-C. Chu
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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, $<H>$, 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 $<H>$ at CMB recombination to its present value, to be [0.97, 1.02].
Comments: 7 pages, 6 figures, minor changes of format to conform with PRD format
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.0391 [astro-ph]
  (or arXiv:0706.0391v2 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.0391
Journal reference: Phys.Rev.D76:043525,2007
Related DOI: https://doi.org/10.1103/PhysRevD.76.043525

Submission history

From: Kwan Chuen Chan [view email]
[v1] Mon, 4 Jun 2007 08:26:56 UTC (173 KB)
[v2] Wed, 29 Aug 2007 22:09:04 UTC (173 KB)
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