A new upper limit on optical bursts from primordial black hole explosions

Astronomy and Astrophysics – Astronomy

Scientific paper

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Black Holes (Astronomy), Electromagnetic Pulses, Light (Visible Radiation), Stellar Radiation, Cerenkov Radiation, Cosmic Ray Showers, Cosmology, Explosions

Scientific paper

Two wide-angle photomultiplier systems were simultaneously operated over a baseline of nearly 30 km in a search for cosmic optical bursts of fractional microsecond time-scale. In 74 hours of overlapping observation, one event was recorded coincident to 1 ms as against the corresponding accidental coincidence value of 0.14 from Cerenkov light pulses from unrelated cosmic ray showers. The possible cosmic origin of this event, including that from primordial black-hole explosions, is discussed and the corresponding upper limits derived.

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