Phys. Rev. Lett. 87, 051301 (2001) [4 pages]New Supernova Limit on Large Extra Dimensions: Bounds on Kaluza-Klein Graviton ProductionReceived 22 March 2001; published 11 July 2001 If large extra dimensions exist in nature, supernova (SN) cores will emit large fluxes of Kaluza-Klein gravitons, producing a cosmic background of these particles with energies and masses up to about 100 MeV. Radiative decays then give rise to a diffuse cosmic γ-ray background with Eγ≲100MeV which is well in excess of the observations if more than 0.5%–1% of the SN energy is emitted into the new channel. For two extra dimensions we derive a conservative bound on their radius of R≲0.9×10-4mm; for three extra dimensions it is R≲1.9×10-7mm. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.051301
DOI:
10.1103/PhysRevLett.87.051301
PACS:
97.60.Bw, 04.50.+h, 11.10.Kk, 11.25.Mj
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