Experimental search for gamma-ray bursts from evaporating primordial black holes

Experimental search for evaporating primordial black holes

“…To date, the search for evaporating PBHs using the chromospheric models predictions has been carried out only on the Andyrchy and Carpet-2 shower arrays of the Baksan Neutrino Observatory [10,21]. The total lifetime of this experiment is 8.6 y.…”

“…This circumstance leads to a smaller effective volume of space surveyed by the arrays. As a consequence, less strict constraints (at the 99% conˇdence level) for the PBH number density were obtained for the chromospheric models [10]: ρ lim = 5 • 10 9 pc −3 • y −1 for the H97 model and ρ lim = 10 9 pc −3 • y −1 for the DK02 model.…”

Search for high energy gamma-ray bursts

“…The monitoring is performed through simultaneous measurements (also every second) of the count rates in four parts of the array containing 10, 9, 9, and 9 detectors. Using such information allows us to eliminate the 1 s points with unreasonably large deviations of the count rate between the different parts of the array (Petkov et al, 2010).…”

“…The only event with a large excess in the Andyrchy count rate (7.9σ ) was recorded on April 17, 2002, at 17:31:29 UT; no GRBs were observed by spacecrafts at this time. This event is, most probable, due to the synchronous electromagnetic noise emerging in the power cables of the recording system or that induced on the signal cables of all array detectors (Petkov et al, 2010).…”

Multimessenger search for evaporating primordial black holes

“…The discovery potential for joint detections of multimessenger bursts due to evaporating PBHs has examined for IceCube (neutrinos), HAWC (gamma rays) and Pierre Auger (gamma rays, neutrons and protons). Only model without a chromosphere [6] ] was considered for such search, because a PBH chromosphere [7,8] would give steeper particle spectra making these high-energy experiments not suitable for detection of the PBH bursts [15]. It was argued that this multimessenger approach is essential to distinguish between bursts due to PBHs and other possible sources, should a positive detection occur.…”