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, with gravitons then being trapped around the newly born neutron stars and decaying into two gamma rays, making neutron stars gamma-ray sources. We strengthen the limits on the radius of compactification of extra dimensions for a small number 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 the constraint on the compactification radius is .
- Received 15 September 2003
DOI:https://doi.org/10.1103/PhysRevLett.92.111102
©2004 American Physical Society