Varying Alpha in a More Realistic Universe

Details Varying Alpha in a More Realistic Universe Varying Alpha in a More Realistic Universe

2003-06-02

arxiv.org/abs/astro-ph/0306047v3

Phys.Lett.B581:141-146,2004

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures. An extra section added describing the spherical collapse model. References added. Accepted for publication

Scientific paper

10.1016/j.physletb.2003.12.016

We study the space-time evolution of the fine structure constant, $\alpha$, inside evolving spherical overdensities in a lambda-CDM Friedmann universe using the spherical infall model. We show that its value inside virialised regions will be significantly larger than in the low-density background universe. The consideration of the inhomogeneous evolution of the universe is therefore essential for a correct comparison of extragalactic and solar system limits on, and observations of, possible time variation in $\alpha$ and other constants. Time variation in $\alpha$ in the cosmological background can give rise to no locally observable variations inside virialised overdensities like the one in which we live, explaining the discrepancy between astrophysical and geochemical observations.

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