中子星并合对应体的记忆效应
Memory effect from neutron star merger counterparts
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中文总结 AI 辅助
本研究量化双中子星并合产生的非线性与线性引力波记忆，评估其在ET和LISA上的可探测性，发现非线性记忆可探测，线性记忆仅在极端有利情形下可见。
中文摘要 AI 辅助
引力波（GW）记忆效应是广义相对论的一个预言，其特征是时空几何发生永久性改变。尽管尚未被观测到，但下一代探测器，如爱因斯坦望远镜（ET）和激光干涉空间天线（LISA），预计将提供首次探测所需的灵敏度。引力波记忆包含两个不同的贡献：非线性记忆，由引力波的自相互作用产生；以及线性记忆，源于与天体物理瞬变相关的物质和辐射的各向异性发射。在这项工作中，我们量化了双中子星并合（BNS）过程中产生的非线性记忆和线性记忆贡献，包括与引力波、伽马射线暴（GRB）、余辉、中微子、动力学和盘风抛射物以及千新星辐射相关的贡献。我们通过两个应用评估了所得记忆信号在ET和LISA上的可探测性。首先，我们将我们的分析应用于多信使事件GW170817 - GRB 170817A - AT2017gfo。我们发现，该事件的组合记忆信号本应可被ET以信噪比10.7探测到，其中非线性记忆占主导。我们还评估了GRB记忆在合成GRB群体中的可探测性，发现只有极端能量且联合有利的构型才能在ET中产生可探测信号。总之，这些结果表明，虽然下一代探测器将探测非线性记忆，但观测来自BNS对应体的线性记忆仍将难以实现，除非在最有利的情景下。
英文摘要
The gravitational-wave (GW) memory effect is a prediction of general relativity, characterized by a permanent change in spacetime geometry. Although it has not yet been observed, next-generation detectors such as the Einstein Telescope (ET) and the Laser Interferometer Space Antenna (LISA) are expected to provide the sensitivity required for its first detection. GW memory comprises two distinct contributions: the nonlinear memory, generated by the self-interaction of GWs, and the linear memory, originating from the anisotropic emission of matter and radiation associated with astrophysical transients. In this work, we quantify both nonlinear and linear memory contributions produced during binary neutron star mergers (BNSs), including those associated with GWs, gamma-ray bursts (GRBs), afterglows, neutrinos, dynamical and disk-wind ejecta, and kilonova emission. We evaluate the detectability of the resulting memory signals with ET and LISA through two applications. First, we apply our analysis to the multi-messenger event GW170817 - GRB 170817A - AT2017gfo. We find that the combined memory signal from this event would have been detectable by ET with a signal-to-noise ratio of 10.7 dominated by the nonlinear memory. We also assess the detectability of the GRB memory across a synthetic population of GRBs, and find that only extreme-energy and jointly favorable configurations could produce a detectable signal in ET. Together, these results demonstrate that while next-generation detectors will probe nonlinear memory, observing linear memory from BNS counterparts will remain elusive except in the most favorable scenarios.
发表机构
- Université de Liège（列日大学）
- Sorbonne Université（索邦大学）
- KU Leuven（荷语鲁汶大学）
- Sun Yat-Sen University（中山大学）
- University of New Hampshire（新罕布什尔大学）
- University of Ferrara（费拉拉大学）
- INFN, Sezione di Ferrara（意大利国家核物理研究所费拉拉分部）
机构由 AI 辅助整理，请以论文原文为准。
