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Gamma rays from the Galactic bulge and large extra dimensions | | Michel Casse
; Jacques Paul
; Gianfranco Bertone
; Guenter Sigl
; | | Date: |
15 Sep 2003 | | Journal: | Phys.Rev.Lett. 92 (2004) 111102 | | Subject: | hep-ph astro-ph gr-qc hep-th | | Abstract: | An 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 $R<400mu$m, overlapping with the distance ($180mu$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 $nlesssim4$ and if strong gravity is around a TeV, the compactification topology is to be more complex than that of a torus. | | Source: | arXiv, hep-ph/0309173 | | Other source: | [GID 963411] pmid15089121 | | Services: | Forum | Review | PDF | Favorites | |
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