Cassé Michel, Paul Jacques, Bertone Gianfranco, Sigl Günter
DAPNIA/Service d'Astrophysique, CEA-Saclay, 91191 Gif-sur-Yvette, France.
Phys Rev Lett. 2004 Mar 19;92(11):111102. doi: 10.1103/PhysRevLett.92.111102.
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 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 microm.
额外维度的一个有趣特征是，在大质量恒星的核心坍缩过程中，核子 - 核子轫致辐射可能产生卡鲁扎 - 克莱因引力子，然后引力子被困在新形成的中子星周围并衰变成两个伽马射线，使中子星成为伽马射线源。我们通过考虑银河系中心区域所有中子星的伽马射线发射，而非此类中距离最近的成员，加强了对于少量额外维度（数量为n）紧致化半径的限制，或者等效地加强了量子引力基本尺度的限制。对于n = 1，紧致化半径的约束为R < 400微米。
