Time Variation of the Fine Structure Constant in the Spacetime of a Domain Wall
arXiv:astro-ph/0510825 · doi:10.1142/S0217732307023006
Abstract
The gravitational field produced by a domain wall acts as a medium with spacetime-dependent permittivity ε. Therefore, the fine structure constant α= e^2/4 πεwill be a time-dependent function at fixed position. The most stringent constraint on the time-variation of αcomes from the natural reactor Oklo and gives |\dotα/α| < few 10^{-17} yr^{-1}. This limit constrains the tension of a cosmic domain wall to be less than σ\lesssim 10^{-2} MeV^3, and then represents the most severe limit on the energy density of a cosmic wall stretching our Universe.
arXiv commentNew version, accepted for publication in MPLA
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