XXth International Conference on Neutrino Physics and Astrophysics

Poster Abstract


New Possible Source of Huge Neutrino Bursts

We predict that white dwarf (WD) matter absorption by a primordial black hole (PBH) can give rise to abundant neutrino emission. It is shown that PBH of masses M > 5x10^14 g are able to absorb WD completely for the time of their existence, giving rise to formation of black holes of WD mass. Neutrino emission accompanies the neutronization caused by the accreting WD matter compression. The duration of the neutrino burst accompanying the final stage of WD absorption will not considerably exceed the free fall time (> 0.1 s). The total neutrino burst energy can reach 10^52 erg in case of WD central density equal to 10^9 g/cm^3. Unlike the supernova explosion, the predicted neutrino burst is accompanied by neither antineutrino nor ? and ? neutrino emission. If such a burst occurs at the typical distance of 10 kpc it may cause up to 50 events of ? scattering in the Super-Kamiokande detector. The predicted mechanism of neutrino emission can give fifteen orders higher contribution to the diffuse cosmic neutrino flux than the PBH Hawking neutrino radiation.

Based on S.E.Juralevich & V.V.Tikhomirov, astro-ph/0202445

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