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

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

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 6.1times 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.

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