Bulk photons in asymmetrically warped spacetimes and non-trivial vacuum refractive index

Farakos, K; Mavromatos, NE; Pasipoularides, P

dc.contributor.author	Farakos, K	en
dc.contributor.author	Mavromatos, NE	en
dc.contributor.author	Pasipoularides, P	en
dc.date.accessioned	2014-03-01T01:29:57Z
dc.date.available	2014-03-01T01:29:57Z
dc.date.issued	2009	en
dc.identifier.issn	1126-6708	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19414
dc.subject	Classical theories of gravity	en
dc.subject	Field theories in higher dimensions	en
dc.subject	High energy cosmic rays	en
dc.subject	Large extra dimensions	en
dc.subject.classification	Physics, Particles & Fields	en
dc.subject.other	GAMMA-RAY BURSTS	en
dc.subject.other	COSMOLOGICAL CONSTANT	en
dc.subject.other	RADION STABILIZATION	en
dc.subject.other	LORENTZ VIOLATION	en
dc.subject.other	EXTRA DIMENSIONS	en
dc.subject.other	HIGH-ENERGY	en
dc.subject.other	GRAVITY	en
dc.subject.other	MODELS	en
dc.subject.other	LIGHT	en
dc.subject.other	TEV	en
dc.title	Bulk photons in asymmetrically warped spacetimes and non-trivial vacuum refractive index	en
heal.type	journalArticle	en
heal.identifier.primary	10.1088/1126-6708/2009/01/057	en
heal.identifier.secondary	http://dx.doi.org/10.1088/1126-6708/2009/01/057	en
heal.identifier.secondary	057	en
heal.language	English	en
heal.publicationDate	2009	en
heal.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(ømega) = 1+cGømega2, where ømega 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. © 2009 SISSA.	en
heal.publisher	INT SCHOOL ADVANCED STUDIES	en
heal.journalName	Journal of High Energy Physics	en
dc.identifier.doi	10.1088/1126-6708/2009/01/057	en
dc.identifier.isi	ISI:000265578400057	en
dc.identifier.volume	2009	en
dc.identifier.issue	1	en