Kavli Affiliate: Li Xin Li
| First 5 Authors: Zhen Cao, F. Aharonian, Y. X. Bai, Y. W. Bao, D. Bastieri
| Summary:
Primordial Black Holes~(PBHs) are hypothetical black holes with a wide range
of masses that formed in the early universe. As a result, they may play an
important cosmological role and provide a unique probe of the early universe. A
PBH with an initial mass of approximately $10^{15}$~g is expected to explode
today in a final burst of Hawking radiation. In this work, we conduct an
all-sky search for individual PBH burst events using the data collected from
March 2021 to July 2024 by the Water Cherenkov Detector Array of the Large High
Altitude Air Shower Observatory (LHAASO). Three PBH burst durations, 10~s,
20~s, and 100~s, are searched, with no significant PBH bursts observed. The
upper limit on the local PBH burst rate density is set to be as low as
181~pc$^{-3}$~yr$^{-1}$ at 99$%$ confidence level, representing the most
stringent limit achieved to date.
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