重新审视亮暗引力波标准汽笛在宇宙学中的作用
Reconsidering the role of bright and dark gravitational-wave standard sirens for cosmology
浏览论文内容
中文总结 AI 辅助
本文重新评估亮暗引力波标准汽笛在宇宙学中的作用，证明亮汽笛可打破哈勃常数与物质密度参数的简并，暗汽笛辅以先验也能解决哈勃张力，并提出统一统计框架，指出独立处理二者在后续观测中影响有限但可能偏置质量谱低端。
中文摘要 AI 辅助
引力波（GW）标准汽笛已成为探测宇宙膨胀的有力工具。它们通常被分为两类：亮汽笛，即与电磁（EM）对应体同时被观测到的引力波事件；以及暗汽笛，即没有电磁对应体而被探测到的事件。亮汽笛常被视为精密宇宙学的主要途径；然而，在LIGO-Virgo-KAGRA（LVK）合作组织的最新观测运行之后，涉及中子星（NSs）的致密天体并合率的估计值有所下降。在本信中，我们重新审视了亮暗汽笛在精密宇宙学中将发挥的作用。我们证明，尽管亮汽笛的探测数量较少，但它们将在实现解决哈勃张力所需的精度方面发挥关键作用，主要通过打破暗汽笛固有的哈勃常数（$H_0$）与物质密度参数（$\Omega_m$）之间的简并。另外，我们表明，当补充一个关于$\Omega_m$的外部先验时，仅靠暗汽笛也能解决$H_0$张力。此外，我们提出了一个用于亮暗汽笛引力波宇宙学的自洽统计框架，尽管它们源于相同的黑洞（BHs）和中子星（NSs）底层种群，但传统上它们被视为独立种群。最后，我们发现，在接下来的LVK观测运行中，将亮暗汽笛视为独立种群不会显著偏置引力波宇宙学，但可能导致质量谱低端部分的重建出现偏差。
英文摘要
Gravitational-wave (GW) standard sirens have emerged as powerful probes of cosmic expansion. They are commonly divided into two classes: bright sirens, observed in coincidence with an electromagnetic (EM) counterpart, and dark sirens, detected without one. Bright sirens have often been considered the main avenue for precision cosmology; however, following the latest observing run of the LIGO-Virgo-KAGRA (LVK) collaboration, the estimates of merger rates of compact objects involving neutron stars (NSs) have decreased. In this Letter, we reconsider the role that bright and dark sirens will play in precision cosmology. We demonstrate that bright sirens, although detected in small numbers, will play a crucial role in achieving the precision needed to address the Hubble tension, primarily by breaking the degeneracy between the Hubble constant ($H_0$) and the matter density parameter ($Ω_m$) inherent to dark sirens. Alternatively, we show that dark sirens alone can resolve the $H_0$ tension when supplemented with an external prior on $Ω_m$. Furthermore, we present a self-consistent statistical framework for GW cosmology with bright and dark sirens, which have traditionally been treated as independent populations although they originate from the same underlying population of black holes (BHs) and NSs. Finally, we find that treating bright and dark sirens as independent populations will not significantly bias GW cosmology in the next LVK observing runs, but can lead to a biased reconstruction of the low-mass end of the mass spectrum.
发表机构
- INFN, Sezione di Roma（意大利国家核物理研究所罗马分部）
- Università di Roma “La Sapienza”（罗马大学）
机构由 AI 辅助整理，请以论文原文为准。
