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http://eprints.org/relation/isVersionOf http://eprints.iliauni.edu.ge/id/document/2805 http://eprints.org/relation/isVolatileVersionOf http://eprints.iliauni.edu.ge/id/document/2805 http://eprints.org/relation/issmallThumbnailVersionOf http://eprints.iliauni.edu.ge/id/document/2805 archive 131 disk0/00/00/07/27 2014-01-29 19:48:14 2015-03-27 07:02:43 2014-01-29 19:48:14 article show Baukh Viktor Zhuk Alexander Kahniashvili Tina tinatin@iliauni.edu.ge pub QC public We consider an effective model of photon interaction with a 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 the use of the experimental bounds of the time delay of gamma-ray burst photon propagation as an additional constraint for the gravexciton parameters. 2007 published Physical Review D 76 027502 TRUE