Gamma rays from the Galactic bulge and large extra dimensions - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2004

Gamma rays from the Galactic bulge and large extra dimensions

Résumé

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 $R<400\mu$m, overlapping with the distance ($180\mu$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.

Dates et versions

in2p3-00023498 , version 1 (21-12-2004)

Identifiants

Citer

M. Cassé, J. C. Paul, G. Bertone, G. Sigl. Gamma rays from the Galactic bulge and large extra dimensions. Physical Review Letters, 2004, 92, pp.111102. ⟨10.1103/PhysRevLett.92.111102⟩. ⟨in2p3-00023498⟩
28 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More