De Luca V, Desjacques V, Franciolini G, Pani P, Riotto A
Département de Physique Théorique and Centre for Astroparticle Physics (CAP), Université de Genève, 24 quai E. Ansermet, CH-1211 Geneva, Switzerland.
Physics department and Asher Space Science Institute, Technion, Haifa 3200003, Israel.
Phys Rev Lett. 2021 Feb 5;126(5):051101. doi: 10.1103/PhysRevLett.126.051101.
The LIGO/Virgo Collaboration has recently observed GW190521, the first binary black hole merger with at least the primary component mass in the mass gap predicted by the pair-instability supernova theory. This observation disfavors the standard stellar-origin formation scenario for the heavier black hole, motivating alternative hypotheses. We show that GW190521 cannot be explained within the primordial black hole (PBH) scenario if PBHs do not accrete during their cosmological evolution, since this would require an abundance which is already in tension with current constraints. On the other hand, GW190521 may have a primordial origin if PBHs accrete efficiently before the reionization epoch.
激光干涉引力波天文台（LIGO）/处女座（Virgo）合作组织最近观测到了GW190521，这是首个双黑洞合并事件，其中至少主成分质量处于对不稳定超新星理论预测的质量间隙内。这一观测结果不支持较重黑洞的标准恒星起源形成图景，从而促使人们提出其他假设。我们表明，如果原初黑洞（PBH）在其宇宙演化过程中不吸积，那么GW190521就无法在原初黑洞情形中得到解释，因为这将需要一个已经与当前限制存在矛盾的丰度。另一方面，如果原初黑洞在再电离时代之前有效地吸积，那么GW190521可能具有原初起源。
