评估用于双中子星多信使观测的神乐引力波探测器升级方案
Evaluating KAGRA upgrade scenarios for multimessenger observations of binary neutron stars
AI总结：
研究双中子星合并观测中KAGRA探测器升级方案，提出结合费舍尔矩阵估计等的计算框架，应用于升级方案评估，发现高频升级定位提高约20%，考虑探测率时宽带升级事件更多，加入KAGRA使定位事件数增约60%，提供评估框架。
AI中文摘要：
双中子星合并是多信使天文学的关键目标，推动了引力波探测器的未来升级。对于神乐引力波探测器（KAGRA），既要考虑提高双中子星探测范围的宽带灵敏度改进，也要考虑针对中子星物理的高频优化。我们提出了一个计算效率高的框架，通过将定位区域和定位体积的费舍尔矩阵估计与探测器工作因子和双中子星合并率相结合，来评估探测器升级的多信使性能。我们将此框架应用于LIGO-Virgo-KAGRA网络中提议的KAGRA升级方案。对于相同的源，高频升级与宽带升级相比，天空定位提高了约20%。然而，考虑到探测率时，宽带升级产生更多定位良好的事件。尽管其双中子星探测范围比其他探测器短，但加入KAGRA使在10³ Mpc³体积内定位的事件数量增加了约60%。这些结果为从多信使观测角度评估未来探测器升级提供了一个定量框架。
英文摘要：
Binary neutron star mergers are key targets for multimessenger astronomy, motivating future upgrades of gravitational-wave detectors. For KAGRA, both broadband sensitivity improvements that increase the binary neutron star detection range, and high-frequency optimizations targeting neutron-star physics are under consideration. We present a computationally efficient framework to evaluate the multimessenger performance of detector upgrades by combining Fisher-matrix estimates of localization area and localization volume with detector duty factors and binary neutron star merger rates. We apply this framework to proposed KAGRA upgrade scenarios within the LIGO-Virgo-KAGRA network. For identical sources, the high-frequency upgrade improves sky localization by about 20% compared with the broadband option. However, when detection rates are taken into account, the broadband upgrade yields a larger number of well-localized events. Despite its shorter binary neutron star range than the other detectors, the inclusion of KAGRA increases the number of events localized within $10^3$ Mpc$^3$ volume by about 60%. These results provide a quantitative framework for evaluating future detector upgrades from the perspective of multimessenger observations.
