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- W1983178781 abstract "We consider asymmetrically warped brane models, or equivalently brane models where the background metric is characterized by different time and space warp factors. The main feature of these models is that 4D Lorentz symmetry is violated for fields which propagate in the bulk, such as gravitons. In this paper we examine the case of bulk photons in asymmetrically warped brane models. Although our results are general, we examine here two specific but characteristic solutions: 1) AdS-Schwarzschild 5D Black Hole solution and 2) AdS-Reissner Nordstrom 5D Black Hole solution. We show that the standard Lorentz invariant dispersion relation for 4D photons is corrected by nonlinear terms which lead to an Energy-dependent speed of light. Specifically, we obtain a sub-luminous Energy-dependent refractive index of the form neff(omega) = 1+cG omega2, where omega is the energy of the photon, and the factor cG is always positive and depends on the free parameters of the model. Finally, comparing the results with recent data from the MAGIC Telescope, claiming a delayed arrival of photons from the Active Galactic Nucleus of Mk501, we impose concrete restrictions to the two sets of models examined in this work. We shall also discuss briefly other possible astrophysical constraints on our models." @default.
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- W1983178781 date "2009-01-23" @default.
- W1983178781 modified "2023-09-25" @default.
- W1983178781 title "Bulk photons in asymmetrically warped spacetimes and non-trivial vacuum refractive index" @default.
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- W1983178781 doi "https://doi.org/10.1088/1126-6708/2009/01/057" @default.
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