A New Limit on the Rate-Density of Evaporating Black Holes

Session 55 -- SN 1993J; High Energy Astrophysics
Oral presentation, Wednesday, 10:30-12:00, Dwinelle 145 Room

[55.08] A New Limit on the Rate-Density of Evaporating Black Holes

D. Coyne (UCSC), S.~Biller, P.~Chumney, M.~Harmon, A.~Shoup, G.B.~Yodh (U.C.Irvine), D.E.~Alexandreas (U.C.Irvine, INFN-Padova), G.E.~Allen, C.Y.~Chang, M.L.~Chen, C.~Dion, J.A.~Goodman, T.J.~Haines, M.J.~Stark (U.Maryland), G.M.~Dion (U.Maryland, ICRR-Tokyo), D.~Berley (U.Maryland, NSF), R.L.~Burman, C.M.~Hoffman, D.E.~Nagle, D.M. Schmidt, C. Sinnis, D.D.~Weeks (LANL), W.P.~Zhang (LANL, NASA-GSFC), R.W.~Ellsworth (George Mason U.), M.~Cavalli-Sforza, D.~Coyne, D.~Dorfan, L.~Kelley, S. Klein, R.~Schnee, D.A.~Williams, T.~Yang, (U.C.Santa Cruz), J.-P.~Wu (U.C.Riverside)

Data taken with the CYGNUS detector between 1989 and 1993 have been used to search for 1 second bursts of ultra-high energy (UHE) gamma rays from any point in the northern sky. There is no evidence for such bursts. Therefore the theory-dependent upper limit on the rate-density of evaporating black holes is $6.1\times 10^5 pc^{-3}yr^{-1}$ at the $99\%$ C.L.. After renormalizing previous direct searches to the same theory, this limit is the most restrictive by more than 2 orders of magnitude.

Wednesday program listing