Spacetime variation of $α$ and the CMB power spectra after the recombination

Details Spacetime variation of $α$ and the CMB power spectra after the recombination Spacetime variation of $α$ and the CMB power spectra after the recombination

2009-04-07

arxiv.org/abs/0904.1061v2

Mod.Phys.Lett.A26:43-52,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages; references added, typos corrected

Scientific paper

10.1142/S0217732311034360

The possible variation of the fine structure constant may be due to the non-minimal coupling of the electromagnetic field to a light scalar field which can be the candidate of dark energy. Its dynamical nature renders the fine structure constant varies with time as well as space. In this paper we point out the spatial fluctuation of the fine structure will modify the power spectra of the temperature and the polarization of the cosmic microwave background. We show explicitly that the fluctuations of the coupled scalar field generate new temperature anisotropies at the linear order and induce a $B$ mode to the polarization at higher order in general.

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