McNeill Lucy O, Thrane Eric, Lasky Paul D
Monash Centre for Astrophysics, School of Physics and Astronomy, Monash University, Victoria 3800, Australia.
OzGrav: The ARC Centre of Excellence for Gravitational-wave Discovery, Hawthorn, Victoria 3122, Australia.
Phys Rev Lett. 2017 May 5;118(18):181103. doi: 10.1103/PhysRevLett.118.181103. Epub 2017 May 4.
Gravitational-wave memory manifests as a permanent distortion of an idealized gravitational-wave detector and arises generically from energetic astrophysical events. For example, binary black hole mergers are expected to emit memory bursts a little more than an order of magnitude smaller in strain than the oscillatory parent waves. We introduce the concept of "orphan memory": gravitational-wave memory for which there is no detectable parent signal. In particular, high-frequency gravitational-wave bursts (≳kHz) produce orphan memory in the LIGO/Virgo band. We show that Advanced LIGO measurements can place stringent limits on the existence of high-frequency gravitational waves, effectively increasing the LIGO bandwidth by orders of magnitude. We investigate the prospects for and implications of future searches for orphan memory.
引力波记忆表现为理想化引力波探测器的永久性畸变，通常源于高能天体物理事件。例如，预计双黑洞合并会发出记忆脉冲，其应变比振荡母波小一个多数量级。我们引入“孤儿记忆”的概念：即不存在可探测母信号的引力波记忆。特别是，高频引力波爆发（≳kHz）会在LIGO/处女座探测器频段产生孤儿记忆。我们表明，先进LIGO测量可以对高频引力波的存在施加严格限制，有效地将LIGO带宽提高几个数量级。我们研究了未来搜索孤儿记忆的前景及其意义。
