The most promising variation of the standard siren technique combines gravitational-wave (GW) data for binary neutron star (BNS) mergers with redshift measurements enabled by their electromagnetic (EM) counterparts, to constrain cosmological parameters such as H ₀, Ω _m , and w ₀. Here we evaluate the near- and long-term prospects of multimessenger cosmology in the era of future GW observatories: Advanced LIGO Plus (A+, 2025), Voyager-like detectors (2030s), and Cosmic Explorer–like detectors (2035 and beyond). We show that the BNS horizon distance of ≈ 700 Mpc for A+ is well matched to the sensitivity of the Vera C. Rubin Observatory (VRO) for kilonova detections. We find that one year of joint A+ and VRO observations will constrain the value of H ₀ to percent-level precision, given a small investment of VRO time dedicated to target-of-opportunity GW follow-up. In the Voyager era, the BNS–kilonova observations begin to constrain Ω _m with an investment of a few percent of VRO time. With the larger BNS horizon distance in the Cosmic Explorer era, on-axis short gamma-ray bursts (SGRBs) and their afterglows (though accompanying only some of the GW-detected mergers) supplant kilonovae as the most promising counterparts for redshift identification. We show that five years of joint observations with Cosmic Explorer–like facilities and a next-generation gamma-ray satellite with localization capabilities similar to that presently possible with Swift could constrain both Ω _m and w ₀ to 15%–20%. We therefore advocate for a robust target-of-opportunity (ToO) program with VRO, and a wide-field gamma-ray satellite with improved sensitivity in the 2030s, to enable standard siren cosmology with next-generation gravitational-wave facilities.

标准警报器技术结合引力波（GW）数据为二进制中子星的最有希望的变体（BNS）合并与红移测量能够通过他们的电磁（EM）的对应，来约束宇宙学参数如ħ ₀，Ω_米，和w ₀ 。在这里，我们评估了未来GW观测站时代的多信使宇宙学的近期和长期前景：先进的LIGO Plus（A +，2025年），类似旅行者号的探测器（2030年代）和类似Cosmic Explorer的探测器（2035年及以后） 。我们显示，A +的BNS地平线距离约为700 Mpc，非常适合于维拉C.鲁宾天文台（VRO）的千伏探测。我们发现，由于专门用于机会目标GW跟踪的VRO时间的少量投资，一年的A +和VRO联合观测将把H ₀的值限制在百分比级别的精度上。在航海时代，BNS-kilonova观测开始约束Ω_米 花费了VRO时间的百分之几。随着Cosmic Explorer时代中BNS视距的增大，同轴短伽玛射线暴（SGRB）及其余辉（尽管仅伴随着被GW检测到的一些合并）取代了千变万化，成为红移识别最有希望的对应物。我们表明，五年联合观测宇宙资源管理器类似设施，并与类似于目前可能的本地化能力与斯威夫特下一代伽玛射线卫星可能会限制双方Ω_米和w ^ ₀ 到15％–20％。因此，我们提倡采用VRO进行稳健的机会目标（ToO）计划，并在2030年代提高灵敏度的宽视场伽马射线卫星，以实现具有下一代引力波设施的标准警报器宇宙学。