Constraining the local burst rate density of primordial black holes with HAWC
Constraining the local burst rate density of primordial black holes with HAWC
复制标题
用HAWC约束原初黑洞的局部爆发率密度
DOI：
10.1088/1475-7516/2020/04/026
复制
发表时间：
2020
影响因子：
6.4
通讯作者：
BenZvi, S.Y.
中科院分区：
文献类型：
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作者：
Albert, A.;Alfaro, R.;Alvarez, C.;Arteaga-Velázquez, J.C.;Arunbabu, K.P.;Rojas, D. Avila;Solares, H.A. Ayala;Baghmanyan, V.;Belmont-Moreno, E.;BenZvi, S.Y.
原始黑洞（PBHs）可能是由早期宇宙的密度波动产生的，其质量可能达到10倍太阳质量，也可能只有普朗克质量那么小。据推测，黑洞的温度与其质量成反比，并会通过霍金辐射热发射出所有种类的基本粒子。初始质量为~ 5× 10 14 g（约十亿吨）的PBHs今天应该会伴随着GeV-TeV能量范围内的高能伽马辐射爆发而结束。高空水切伦科夫（HAWC）天文台对能量在~ 300 GeV到超过100 TeV的伽马射线很敏感，这对应于PBH爆发谱的高端。凭借其大的瞬时视场~ 2sr和超过95%的占空比，HAWC天文台非常适合对PBH爆发进行全天搜索。我们使用959天的HAWC数据进行了搜索，并以99%的置信度排除了超过3400 pc−3 yr−1的局部PBH爆发率密度，这是任何现有电磁测量中对局部PBH爆发率密度的最强限制。
Primordial Black Holes (PBHs) may have been created by density fluctuations in the early Universe and could be as massive as> 10 9 solar masses or as small as the Planck mass. It has been postulated that a black hole has a temperature inversely-proportional to its mass and will thermally emit all species of fundamental particles via Hawking Radiation. PBHs with initial masses of∼ 5× 10 14 g (approximately one gigaton) should be expiring today with bursts of high-energy gamma radiation in the GeV-TeV energy range. The High Altitude Water Cherenkov (HAWC) Observatory is sensitive to gamma rays with energies of∼ 300 GeV to past 100 TeV, which corresponds to the high end of the PBH burst spectrum. With its large instantaneous field-of-view of∼ 2 sr and a duty cycle over 95%, the HAWC Observatory is well suited to perform an all-sky search for PBH bursts. We conducted a search using 959 days of HAWC data and exclude the local PBH burst rate density above 3400 pc− 3 yr− 1 at 99% confidence, the strongest limit on the local PBH burst rate density from any existing electromagnetic measurement.