Phys. Rev. Lett. 71, 2524–2527 (1993)New limit on the rate-density of evaporating black holesReceived 12 July 1993; published in the issue dated 18 October 1993 Data taken with the CYGNUS detector between 1989 September and 1993 January have been used to search for 1 s bursts of ultrahigh-energy gamma rays from point sources at arbitrary locations in the northern sky. We find no evidence for such bursts. We set a theory-dependent upper limit on the rate-density of evaporating black holes of 8.5×105 pc-3 yr-1 at the 99% C.L. When the same emission spectrum is used to recalculate previous upper limits based on direct searches, this limit is the most restrictive by nearly 2 orders of magnitude. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.71.2524
DOI:
10.1103/PhysRevLett.71.2524
PACS:
97.60.Lf, 95.85.Pw, 98.70.Rz
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