Stringent neutron-star limits on large extra dimensions
| dc.creator | Hannestad, Steen | |
| dc.creator | Raffelt, Georg G. | |
| dc.date | 2001-10-04 | |
| dc.date | 2002-01-17 | |
| dc.date.accessioned | 2026-07-07T10:32:55Z | |
| dc.date.available | 2026-07-07T10:32:55Z | |
| dc.description | Supernovae (SNe) are copious sources for Kaluza-Klein gravitons which are generic for theories with large extra dimensions. These massive particles are produced with average velocities ~0.5 c so that many of them are gravitationally retained by the SN core. Every neutron star thus has a halo of KK gravitons which decay into nu bar-nu, e^+e^- and gamma gamma on time scales \~10^9 years. The EGRET gamma-flux limits (E_gamma ~ 100 MeV) for nearby neutron stars constrain the fundamental scale for n=2 extra dimensions to M >500 TeV, and M>30 TeV for n=3. The upcoming GLAST satellite is a factor ~30 more sensitive and thus may detect KK decays, for example at the nearby neutron star RX J185635--3754. The requirement that neutron stars are not excessively heated by KK decays implies M>1700 TeV for n=2, and M>60 TeV for n=3. | |
| dc.description | Minor changes, matches version to appear in PRL | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0110067 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0110067 | |
| dc.identifier | Phys.Rev.Lett.88:071301,2002 | |
| dc.identifier | doi:10.1103/PhysRevLett.88.071301 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/178925 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | Astrophysics | |
| dc.title | Stringent neutron-star limits on large extra dimensions | |
| dc.type | text |