Gamma rays from the Galactic bulge and large extra dimensions

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dc.creatorCasse, Michel
dc.creatorPaul, Jacques
dc.creatorBertone, Gianfranco
dc.creatorSigl, Guenter
dc.date2003-09-15
dc.date2004-03-24
dc.date.accessioned2026-07-07T10:28:56Z
dc.date.available2026-07-07T10:28:56Z
dc.descriptionAn intriguing feature of extra dimensions is the possible production of Kaluza--Klein gravitons by nucleon-nucleon bremsstrahlung in the course of core collapse of massive stars, as pointed out by Hannestad and Raffelt. In this event Kaluza--Klein gravitons are copiously produced and a significant fraction of them remains trapped around the newly born neutron stars. They slowly decay into 2 gamma rays, making neutron stars gamma-ray sources. In this letter, we strengthen considerably the limits on the radius of compactification of extra-dimensions for small number $n$ of them, or alternatively the fundamental scale of quantum gravity, considering the gamma-ray emission of the whole population of neutron stars sitting in the Galactic bulge, instead of the closest member of this category. For $n=1$ the constraint on the compactification radius is $R<400μ$m, overlapping with the distance ($180μ$m) at which Newtons law is directly measured. In addition, for n=1 and n=2, the fundamental energy scale of quantum gravity is far beyond the collider technology. These results imply that if $n\lesssim4$ and if strong gravity is around a TeV, the compactification topology is to be more complex than that of a torus.
dc.description4 pages, minor changes to text, matches published version
dc.identifierhttps://arxiv.org/abs/hep-ph/0309173
dc.identifierhttp://arxiv.org/abs/hep-ph/0309173
dc.identifierPhys.Rev.Lett.92:111102,2004
dc.identifierdoi:10.1103/PhysRevLett.92.111102
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177622
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleGamma rays from the Galactic bulge and large extra dimensions
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