标题： 在NANOGrav 12.5年数据集中的大质量引力随机引力波背景搜索 显示英文标题

标题： Search for Stochastic Gravitational-Wave Background from Massive Gravity in the NANOGrav 12.5-Year Data Set

摘要： 引力波提供了一个新的窗口来探测引力的本质，包括回答介导粒子——引力子是否具有非零质量。 脉冲星测时阵列在 $\sim1-100$ 纳赫兹测量随机引力波背景（SGWB）。 最近，北美引力波纳赫兹观测站（NANOGrav）合作组在他们的12.5年数据集中报告了一种未相关的共同谱过程，但没有实质性证据表明该过程来自广义相对论预测的SGWB。 在这项工作中，我们探索了数据集中来自大质量引力的SGWB的可能性，并发现由于较大的贝叶斯因子，无质量引力子更受青睐。 如果没有统计显著的大质量引力预测的相关色散相关性证据，我们在置信水平为 $95\%$ 的情况下，对光子质量小于 $10^{-23}$ eV 的SGWB振幅设定了上限为 $A_{\rm{MG}}<3.21\times 10^{-15}$。 显示英文摘要

摘要： Gravitational waves offer a new window to probe the nature of gravity, including answering if the mediating particle, graviton, has a non-zero mass or not. Pulsar timing arrays measure stochastic gravitational wave background (SGWB) at $\sim1-100$~nanohertz. Recently, the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) collaboration reported an uncorrelated common-spectrum process in their 12.5-year data set with no substantial evidence that the process comes from the SGWB predicted by general relativity. In this work, we explore the possibility of an SGWB from massive gravity in the data set and find that a massless graviton is preferred because of the relatively larger Bayes factor. Without statistically significant evidence for dispersion-related correlations predicted by massive gravity, we place upper limits on the amplitude of the SGWB for graviton mass smaller than $10^{-23}$~eV as $A_{\rm{MG}}<3.21\times 10^{-15}$ at $95\%$ confidence level.