Extra dimensions and Lorentz invariance violation

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We consider effective model where photons interact with scalar field corresponding to conformal excitations of the internal space (geometrical moduli/gravexcitons). We demonstrate that this interaction results in a modified dispersion relation for photons, and consequently, the photon group velocity depends on the energy implying the propagation time delay effect. We suggest to use the experimental bounds of the time delay of gamma ray bursts (GRBs) photons propagation as an additional constrain for the gravexciton parameters.
RevTex, 5 pages, references added and minor changes. Corrected typos in title

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High Energy Physics - Phenomenology, Astrophysics, High Energy Physics - Theory

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http://salesiana.dossiersoluciones.com/handle/123456789/187374

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0704.0314
 http://arxiv.org/abs/0704.0314
 Phys.Rev.D76:027502,2007
 doi:10.1103/PhysRevD.76.027502

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arXiv