NANOGrav 15 年数据集：引力波背景中横向极化模式的搜寻
广义相对论与量子宇宙学
2023-10-19 v1 星系天体物理
高能天体物理现象
摘要
最近我们在 15 年数据集中发现了具有 Hellings 和 Downs（HD）相关的引力波背景的令人信服的证据。这些相关性描述了广义相对论所预测的引力波，其具有两种横向极化模式。然而，更一般的度规引力理论可能具有产生不同脉冲星间相关性的额外极化模式。在这项工作中，我们搜寻 NANOGrav 15 年数据集，以寻找具有四极 Hellings 和 Downs（HD）与标量横向（ST）相关的引力波背景的证据。我们发现 HD 相关性是对数据的最佳拟合，且没有支持 ST 相关性的显著证据。虽然贝叶斯因子显示出对相关信号的强证据，但数据并不强烈偏好任一种相关特征，在比较 HD 与 ST 相关性时贝叶斯因子 ，而在 HD 加 ST 相关性与仅 HD 相关性之间为 。然而，当与 HD 相关性一起建模时，ST 相关性的振幅和谱指数后验是无信息的，HD 过程占了总信号的绝大部分。使用最优统计量（一种聚焦于脉冲星对交叉相关性的频率学技术），我们发现单独拟合时 HD 和 ST 相关性的中位数信噪比分别为 5.0 和 4.6，同时拟合时 HD 和 ST 相关性的中位数信噪比分别为 3.5 和 3.0。虽然每种相关性的信噪比相当，但 HD 的估计振幅和谱指数是对总信号的显著更好拟合，与我们的贝叶斯分析一致。
引用
@article{arxiv.2310.12138,
title = {The NANOGrav 15-year data set: Search for Transverse Polarization Modes in the Gravitational-Wave Background},
author = {Gabriella Agazie and Akash Anumarlapudi and Anne M. Archibald and Zaven Arzoumanian and Jeremy Baier and Paul T. Baker and Bence Bécsy and Laura Blecha and Adam Brazier and Paul R. Brook and Sarah Burke-Spolaor and Rand Burnette and Robin Case and J. Andrew Casey-Clyde and Maria Charisi and Shami Chatterjee and Tyler Cohen and James M. Cordes and Neil J. Cornish and Fronefield Crawford and H. Thankful Cromartie and Kathryn Crowter and Megan E. DeCesar and Dallas DeGan and Paul B. Demorest and Timothy Dolch and Brendan Drachler and Elizabeth C. Ferrara and William Fiore and Emmanuel Fonseca and Gabriel E. Freedman and Nate Garver-Daniels and Peter A. Gentile and Joseph Glaser and Deborah C. Good and Kayhan Gültekin and Jeffrey S. Hazboun and Ross J. Jennings and Aaron D. Johnson and Megan L. Jones and Andrew R. Kaiser and David L. Kaplan and Luke Zoltan Kelley and Matthew Kerr and Joey S. Key and Nima Laal and Michael T. Lam and William G. Lamb and T. Joseph W. Lazio and Natalia Lewandowska and Tingting Liu and Duncan R. Lorimer and Jing Luo and Ryan S. Lynch and Chung-Pei Ma and Dustin R. Madison and Alexander McEwen and James W. McKee and Maura A. McLaughlin and Natasha McMann and Bradley W. Meyers and Chiara M. F. Mingarelli and Andrea Mitridate and Priyamvada Natarajan and Cherry Ng and David J. Nice and Stella Koch Ocker and Ken D. Olum and Timothy T. Pennucci and Benetge B. P. Perera and Nihan S. Pol and Henri A. Radovan and Scott M. Ransom and Paul S. Ray and Joseph D. Romano and Alexander Saffer and Shashwat C. Sardesai and Ann Schmiedekamp and Carl Schmiedekamp and Kai Schmitz and Brent J. Shapiro-Albert and Xavier Siemens and Joseph Simon and Magdalena S. Siwek and Ingrid H. Stairs and Daniel R. Stinebring and Kevin Stovall and Jerry P. Sun and Abhimanyu Susobhanan and Joseph K. Swiggum and Jacob A. Taylor and Stephen R. Taylor and E. Turner and Caner Unal and Michele Vallisneri and Sarah J. Vigeland and Haley M. Wahl and Caitlin A. Witt and Olivia Young},
journal= {arXiv preprint arXiv:2310.12138},
year = {2023}
}
备注
11 pages, 5 figures