If binary black holes form following the successive core collapses of sufficiently massive binary stars, precessional dynamics may align their spins $\mathbf S_1$ and $\mathbf S_2$ and the orbital angular momentum $\mathbf L$ into a plane in which they jointly precess about the total angular momentum $\mathbf J$. These spin orientations are known as spin-orbit resonances since $\mathbf S_1$, $\mathbf S_2$, and $\mathbf L$ all precess at the same frequency to maintain their planar configuration. Two families of such spin-orbit resonances exist, alike in dignity but differentiated by whether the components of the two spins in the orbital plane are either aligned or antialigned. The fraction of binary black holes in each family is determined by the stellar evolution of their progenitors, so if gravitational-wave detectors could measure this fraction they could provide important insights into astrophysical formation scenarios for binary black holes. In this paper, we show that even under the conservative assumption that binary black holes are observed along the direction of $\mathbf J$ (where precession-induced modulations to the gravitational waveforms are minimized), the waveforms of many members of each resonant family can be distinguished from all members of the opposing family in events with signal-to-noise ratios $ρ\simeq 10$, typical of those expected for the first detections with Advanced LIGO/Virgo. We hope that our preliminary findings inspire a greater appreciation of the capability of gravitational-wave detectors to constrain stellar astrophysics and stimulate further studies of the distinguishability of spin-orbit resonant families in more expanded regions of binary black-hole parameter space.
Distinguishing between Black Holes and Neutron Stars within a Population of Weak Tidal Measurements
University of Greifswald（格赖夫斯瓦尔德大学）；Canadian Institute for Theoretical Astrophysics, University of Toronto（多伦多大学加拿大理论天体物理研究所）；University of Toronto（多伦多大学）
Periodic Orbits and Gravitational Wave Signatures around the Bonanno--Reuter Regular Black Hole
School of Physics, Damghan University（达姆甘大学物理学院）；Center for Theoretical Physics, Khazar University（哈扎尔大学理论物理中心）；Department of Physics, Faculty of Basic Sciences, University of Mazandaran（马赞德兰大学基础科学学院物理学系）
Periodic Orbits and Their Gravitational-Wave Signatures around a Rotating Black Hole Surrounded by Perfect Fluid Dark Matter
Zhejiang University of Technology（浙江工业大学）；United Center for Gravitational Wave Physics (UCGWP), Zhejiang University of Technology（引力波物理联合中心（UCGWP），浙江工业大学）；Bahauddin Zakariya University, Vehari Campus（巴哈丁·扎卡里亚大学，韦哈里校区）；Khazar University（哈扎尔大学）
Distinguishing gravity theories with networks of space-based gravitational-wave detectors
International Centre for Theoretical Physics Asia-Pacific, University of Chinese Academy of Sciences（国际理论物理中心亚太分 centre，中国科学院大学）；Taiji Laboratory for Gravitational Wave Universe, University of Chinese Academy of Sciences（引力波宇宙太极实验室，中国科学院大学）；Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences（中国科学院大学杭州高等研究院基础物理与数学学院）
