We present new calculations of X-ray polarization from black hole accretion disks in the thermally-dominated state, using a Monte-Carlo ray-tracing code in full general relativity. In contrast to many previously published studies, our approach allows us to include returning radiation that is deflected by the strong-field gravity of the BH and scatters off of the disk before reaching a distant observer. Although carrying a relatively small fraction of the total observed flux, the scattered radiation tends to be highly polarized and in a direction perpendicular to the direct radiation. We show how these new features of the polarization spectra may be developed into a powerful tool for measuring black hole spin and probing the gas flow in the innermost disk.
Soft X-ray Polarization in Thermal Magnetar Emission
磁星在软X射线波段的发射光谱可能包含直接从中子星表面出现的热成分。然而，在静态光谱中缺乏观测到的吸收特征使得难以直接约束大气的物理性质。我们认为，未来的X射线偏振测量是一个很有前途的技术，直接约束磁星磁场强度和几何形状。我们使用最新的NS大气模型，在磁场B = 4 x 10^13- 5 x 10^14 G的条件下，构造了有限表面热点的观测极化信号模型。我们的计算强烈地依赖于NS磁场强度和几何形状，而较弱地依赖于NS状态方程和大气成分。我们讨论了如何互补的相位分辨光谱和偏振的依赖关系可能会解决退化，目前阻碍使用热模型的磁星物理参数的测定。
Quasi-simultaneous Optical Flux and Polarization Variability of the Binary Super Massive Black Hole Blazar OJ 287 from 2015 to 2023: Detection of an Anticorrelation in Flux and Polarization Variability
Non-thermal Synchrotron Emission and Polarization Signatures during Black Hole Flux Eruptions
School of physics and astronomy, Beijing Normal University（北京师范大学物理与天文学院）；School of Physics, Peking University（北京大学物理学院）；Institute of Fundamental Physics and Quantum Technology, & School of Physical Science and Technology, Ningbo University（宁波大学基础物理与量子技术研究所及物理科学与技术学院）；Tsung-Dao Lee Institute, Shanghai Jiao-Tong University（上海交通大学李政道研究所）
Black Hole Polarimetry: Universal Polarization of Synchrotron Radiation at the Horizon
Niels Bohr International Academy, Niels Bohr Institute（尼尔斯·玻尔国际学院，尼尔斯·玻尔研究所）；Department of Physics & Astronomy, Vanderbilt University（范德堡大学物理与天文学系）；Princeton Gravity Initiative, Princeton University（普林顿引力倡议，普林斯顿大学）；School of Natural Sciences, Institute for Advanced Study（高等研究院自然科学院）；Department of Physics, Princeton University（普林斯顿大学物理系）；Department of Astrophysical Sciences, Princeton University（普林斯顿大学天体科学系）
Polarization Images of Neutron Stars Illuminated by a Thin Accretion Disk: A Comparison with Black Holes
Sichuan Minzu College（四川民族学院）；China West Normal University（西华师范大学）；Chongqing Jiaotong University（重庆交通大学）；Chongqing Bashu Science City Secondary School（重庆巴蜀科学城中学）
Thermal Spin Polarization Driven by Nuclear Spin-Orbit Coupling in Neutron Star Pasta
The University of Tokyo（东京大学）；RIKEN Nishina Center（理化学研究所仁科中心）；Quark Nuclear Science Institute, The University of Tokyo（东京大学夸克核科学研究所）；Institute for Advanced Research, Nagoya University（名古屋大学高等研究院）；Department of Physics, Nagoya University（名古屋大学物理系）；Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS), RIKEN（理化学研究所跨学科理论与数学科学项目（iTHEMS））；Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team, RIKEN Cluster for Pioneering Research (CPR)（理化学研究所前沿研究集群（CPR）非平衡量子统计力学理化学博雅研究团队）；Center for Spintronics Research Network, Keio University（庆应义塾大学自旋电子学研究网络中心）；Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences（中国科学院大学卡弗里理论科学研究院）；Physics Program, Graduate School of Advanced Science and Engineering, Hiroshima University（广岛大学先进理工学研究学院物理学项目）；Hiroshima Astrophysical Science Center, Hiroshima University（广岛大学广岛天体物理科学中心）；Department of Physics, Chiba Institute of Technology (CIT)（千叶工业大学物理系）；Advanced Science Research Center, Japan Atomic Energy Agency（日本原子力研究机构先进科学研究中心）
