Duez Matthew D, Liu Yuk Tung, Shapiro Stuart L, Shibata Masaru, Stephens Branson C
Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
Phys Rev Lett. 2006 Jan 27;96(3):031101. doi: 10.1103/PhysRevLett.96.031101. Epub 2006 Jan 25.
Hypermassive neutron stars (HMNSs)--equilibrium configurations supported against collapse by rapid differential rotation--are possible transient remnants of binary neutron-star mergers. Using newly developed codes for magnetohydrodynamic simulations in dynamical spacetimes, we are able to track the evolution of a magnetized HMNS in full general relativity for the first time. We find that secular angular momentum transport due to magnetic braking and the magnetorotational instability results in the collapse of an HMNS to a rotating black hole, accompanied by a gravitational wave burst. The nascent black hole is surrounded by a hot, massive torus undergoing quasistationary accretion and a collimated magnetic field. This scenario suggests that HMNS collapse is a possible candidate for the central engine of short gamma-ray bursts.
超巨质量中子星（HMNSs）——通过快速差动旋转支撑以抵抗坍缩的平衡构型——可能是双中子星合并的瞬态遗迹。利用新开发的用于动态时空磁流体动力学模拟的代码，我们首次能够在完全广义相对论中追踪磁化HMNS的演化。我们发现，由于磁制动和磁旋转不稳定性导致的长期角动量传输会导致HMNS坍缩成一个旋转黑洞，并伴随引力波爆发。新生黑洞被一个经历准静态吸积的热的、大质量环面和一个准直磁场包围。这种情况表明，HMNS坍缩可能是短伽马射线暴中心引擎的一个候选者。
