The existence of black holes (BHs) of mass at is a big puzzle in astrophysics because even optimistic estimates of the accretion time are insufficient for stellar-mass BHs of to grow into such supermassive BHs. A resolution of this puzzle might be the direct collapse of supermassive stars with mass into massive seed BHs. We find that if a jet is launched from the accretion disk around the central BH, the jet can break out of the star because of the structure of the radiation-pressure-dominated envelope. Such ultralong gamma-ray bursts with duration of –106 s?and flux of 10?11–10-8 erg s-1 cm-2?could be detectable by Swift. We estimate an event rate of . The total explosion energy is 1055–. The resulting negative feedback delays the growth of the remnant BH by about or evacuates the host galaxy completely.
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机译：质量的黑洞（BHs）的存在是天体物理学中的一个大难题，因为即使对吸积时间的乐观估计也不足以使恒星质量的BH成长为超质量的BH。解决这个难题的方法可能是将质量超大质量的恒星直接坍塌成大量的种子BH。我们发现，如果从中心BH周围的吸积盘发射射流，由于辐射压强包络的结构，该射流可以从恒星中爆发。斯威夫特可以探测到这种持续时间为–106 s ?、通量为10？11–10-8 erg s-1 cm-2？的超长伽马射线爆发。我们估计事件发生率为。总爆炸能量为1055–。所产生的负反馈延迟了剩余BH的生长，大约或完全疏散了宿主星系。
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