分析PTA数据的实用方法：六颗脉冲星下的宇宙弦
广义相对论与量子宇宙学
2024-05-06 v3 宇宙学与河外天体物理
高能物理 - 理论
摘要
我们利用欧洲脉冲星计时阵列（EPTA）数据发布2（DR2）中的六颗毫秒脉冲星，搜寻由宇宙弦网络产生的随机引力波背景（SGWB）。我们进行了贝叶斯分析，考虑了宇宙弦环网络的两种模型，并将其与源自超大质量黑洞双星群体的简单幂律模型比较。我们的主要强假设是，先前报道的共红噪声过程为SGWB。我们发现，由于其简洁性，单参数宇宙弦模型比幂律模型略受青睐。如果我们假设数据中存在双分量随机信号（超大质量黑洞双星群体与宇宙弦信号），则对我们考虑的两种宇宙弦模型，得到弦张力的95%上限为（）。在扩展的双参数弦模型中，我们无法约束扭折数目。我们针对最严格的分析测试了两种近似且快速的贝叶斯数据分析方法，得到了相一致的结果。这两种快速高效的方法适用于所有SGWB，与源无关，并将对扩展数据集的分析至关重要。
引用
@article{arxiv.2306.12234,
title = {Practical approaches to analyzing PTA data: Cosmic strings with six pulsars},
author = {Hippolyte Quelquejay Leclere and Pierre Auclair and Stanislav Babak and Aurélien Chalumeau and Danièle A. Steer and J. Antoniadis and A. -S. Bak Nielsen and C. G. Bassa and A. Berthereau and M. Bonetti and E. Bortolas and P. R. Brook and M. Burgay and R. N. Caballero and D. J. Champion and S. Chanlaridis and S. Chen and I. Cognard and G. Desvignes and M. Falxa and R. D. Ferdman and A. Franchini and J. R. Gair and B. Goncharov and E. Graikou and J. -M. Grießmeier and L. Guillemot and Y. J. Guo and H. Hu and F. Iraci and D. Izquierdo-Villalba and J. Jang and J. Jawor and G. H. Janssen and A. Jessner and R. Karuppusamy and E. F. Keane and M. J. Keith and M. Kramer and M. A. Krishnakumar and K. Lackeos and K. J. Lee and K. Liu and Y. Liu and A. G. Lyne and J. W. McKee and R. A. Main and M. B. Mickaliger and I. C. Niţu and A. Parthasarathy and B. B. P. Perera and D. Perrodin and A. Petiteau and N. K. Porayko and A. Possenti and A. Samajdar and S. A. Sanidas and A. Sesana and G. Shaifullah and L. Speri and R. Spiewak and B. W. Stappers and S. C. Susarla and G. Theureau and C. Tiburzi and E. van der Wateren and A. Vecchio and V. Venkatraman Krishnan and J. P. W. Verbiest and J. Wang and L. Wang and Z. Wu},
journal= {arXiv preprint arXiv:2306.12234},
year = {2024}
}
备注
14 pages, 6 figures; typo corrected in (5)