NANOGrav 12.5年数据集：搜寻引力波背景中的非爱因斯坦偏振模式
广义相对论与量子宇宙学
2021-12-20 v1 星系天体物理
高能天体物理现象
摘要
我们在NANOGrav的12.5年数据集中搜寻引力波背景（GWB）的证据，该背景具有广义度量引力理论所允许的所有空间关联。我们发现数据中无实质性证据支持此类关联的存在。我们发现标量横波（ST）关联产生的信噪比和贝叶斯因子高于四极（张量横波，TT）关联。具体而言，我们发现ST关联的信噪比为2.8，其相对于TT关联（Hellings和Downs关联）的贝叶斯优势比约为20:1。然而，当我们纳入太阳系星历系统误差建模和/或完全剔除脉冲星J0030时，ST关联的重要性急剧降低。即便按名义信噪比表面值考虑，对模拟数据集的分析表明，在GWB中仅存在通常TT模式的情况下，观测到此类值并非极不可能。在未能探测到任何引力偏振模式的情况下，我们针对谱指数和参考频率给出了其振幅的上限。在针对八类广义度量引力理论的上限中，对于同时包含TT和ST模式的度量时空理论族，我们得到和。
引用
@article{arxiv.2109.14706,
title = {The NANOGrav 12.5-year data set: Search for Non-Einsteinian Polarization Modes in theGravitational-Wave Background},
author = {Zaven Arzoumanian and Paul T. Baker and Harsha Blumer and Bence Becsy and Adam Brazier and Paul R. Brook and Sarah Burke-Spolaor and Maria Charisi and Shami Chatterjee and Siyuan Chen and James M. Cordes and Neil J. Cornish and Fronefield Crawford and H. Thankful Cromartie and Megan E. DeCesar and Dallas M. DeGan and Paul B. Demorest and Timothy Dolch and Brendan Drachler and Justin A. Ellis and Elizabeth C. Ferrara and William Fiore and Emmanuel Fonseca and Nathan Garver-Daniels and Peter A. Gentile and Deborah C. Good and Jeffrey S. Hazboun and A. Miguel Holgado and Kristina Islo and Ross J. Jennings and Megan L. Jones and Andrew R. Kaiser and David L. Kaplan and Luke Zoltan Kelley and Joey Shapiro Key and Nima Laal and Michael T. Lam and T. Joseph W. Lazio and Duncan R. Lorimer and Tingting Liu and Jing Luo and Ryan S. Lynch and Dustin R. Madison and Alexander McEwen and Maura A. McLaughlin and Chiara M. F. Mingarelli and Cherry Ng and David J. Nice and Ken D. Olum and Timothy T. Pennucci and Nihan S. Pol and Scott M. Ransom and Paul S. Ray and Joseph D. Romano and Shashwat C. Sardesai and Brent J. Shapiro-Albert and Xavier Siemens and Joseph Simon and Magdalena S. Siwek and Renee Spiewak and Ingrid H. Stairs and Daniel R. Stinebring and Kevin Stovall and Jerry P. Sun and Joseph K. Swiggum and Stephen R. Taylor and Jacob E. Turner and Michele Vallisneri and Sarah J. Vigeland and Haley M. Wahl and Caitlin A. Witt},
journal= {arXiv preprint arXiv:2109.14706},
year = {2021}
}
备注
24 pages, 18 figures, 3 appendices. Please send any comments/questions to Nima Laal ([email protected])