孤儿记忆中的引力波
Gravitational Waves from Orphan Memory
摘要：
引力波记忆表现为一个理想化的引力波探测器的永久变形，通常来自高能天体物理事件。例如，二元黑洞合并预计会发出记忆爆发，其应变比振荡母波小一个数量级。我们引入了“孤儿记忆”的概念：引力波记忆，没有可检测的父信号。特别是，高频引力波爆发（$\gtrsim$ kHz）在LIGO/Virgo波段产生孤儿记忆。我们表明，先进的LIGO测量可以严格限制高频引力波的存在，有效地增加了几个数量级的LIGO带宽。我们调查的前景和影响，未来的搜索孤儿记忆。
英文摘要：
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 ($\gtrsim$ 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.
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