Time Variation of the Fine Structure Constant in the Spacetime of a Domain Wall

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dc.creatorCampanelli, L.
dc.creatorCea, P.
dc.creatorTedesco, L.
dc.date2005-10-29
dc.date2007-03-01
dc.date.accessioned2026-07-07T10:27:41Z
dc.date.available2026-07-07T10:27:41Z
dc.descriptionThe 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.
dc.descriptionNew version, accepted for publication in MPLA
dc.identifierhttps://arxiv.org/abs/astro-ph/0510825
dc.identifierhttp://arxiv.org/abs/astro-ph/0510825
dc.identifierMod.Phys.Lett.A22:1013-1018,2007
dc.identifierdoi:10.1142/S0217732307023006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177223
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleTime Variation of the Fine Structure Constant in the Spacetime of a Domain Wall
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