We investigate the evolution of supermassive binary black holes (BBHs) in galaxies with realistic property distributions and the gravitational-wave (GW) radiation from the cosmic population of these BBHs. We incorporate a comprehensive treatment of the dynamical interactions of the BBHs with their environments by including the effects of galaxy triaxial shapes and inner stellar distributions, and generate a large number of BBH evolution tracks. By combining these BBH evolution tracks, galaxy mass functions, galaxy merger rates, and supermassive black hole-host galaxy relations into our model, we obtain the statistical distributions of surviving BBHs, BBH coalescence rates, the strength of their GW radiation, and the stochastic GW background (GWB) contributed by the cosmic BBH population. About ~1%-3% (or ~10%) of supermassive BHs at nearby galactic centers are expected to be binaries with mass ratio >1/3 (or >1/100). The characteristic strain amplitude of the GWB at frequency 1/yr is estimated to be ~$2.0^{+1.4}_{-0.8}\times 10^{-16}$, and the upper bound of its results obtained with the different BH-host galaxy relations can be up to $5.4\times 10^{-16}$, which await testing by future experiments (e.g., the Square Kilometer Array, FAST, Next-Generation Very Large Array). The turnover frequency of the GWB spectrum is at ~0.25nHz. The uncertainties on the above estimates and prospects for detecting individual sources are also discussed. The application of the cosmic BBH population to the Laser Interferometer Space Antenna (LISA) band provides a lower limit to the detection rate of BBHs by LISA, ~0.9/yr.
Effects of dark dipole radiation on eccentric supermassive black hole binary inspirals
School of Astronomy and Space Science, University of Chinese Academy of Sciences (UCAS)（中国科学院大学天文与空间科学学院）；School of Physics, Nanjing University（南京大学物理学院）
Revealing the Origin and Cosmic Evolution of Supermassive Black Holes
下一代电磁波和引力波天文台将为第一批超大质量黑洞的诞生打开前所未有的窗口。这有可能揭示它们在前十亿年的起源和成长，以及它们在本地宇宙中形成历史的特征。考虑到这一点，我们概述了三个关键的重点领域，将塑造研究在未来十年及以后：（1）什么是“种子”的第一类星体;如何达到10亿太阳质量之前，z $\sim7$？(2)黑洞的成长如何随宇宙时间而改变，黑洞的早期成长如何塑造它们的宿主星系？我们能从今天的中等质量黑洞和矮星系中学到什么？(3)我们能否在广义相对论的背景下解开黑洞吸积的物理学，理解流入和流出（喷流和风）？使用这些见解在恒星和超大质量黑洞之间进行缩放是否有效，即，黑洞吸积真尺度不变吗？在下文中，我们确定了加拿大天文学界在解决这些问题方面发挥主导作用的机会，特别是通过利用我们在事件视界望远镜、{ \it James Webb太空望远镜}（JWST）、欧几里得、莫纳克亚光谱探测器（MSE）、30米望远镜（TMT）、平方公里阵列（SKA）、用于光学和紫外线研究的宇宙学高级巡天望远镜（CASTOR）等。我们还讨论了与未来天基引力波（LISA）和X射线（例如，雅典娜，山猫）天文台，以及与恒星和星系演化社区合作的必要性，以建立一个完整的图片的诞生超大质量黑洞，他们的成长和他们的影响，在宇宙的历史。
Coupled Time-Dependent Proton Acceleration and Leptonic-Hadronic Radiation in Turbulent Supermassive Black Hole Coronae
Deutsches Elektronen-Synchrotron DESY（德国电子同步加速器）；National and Kapodistrian University of Athens（雅典国立卡波迪斯特里安大学）；Queen’s University（女王大学）；Arthur B. McDonald Canadian Astroparticle Physics Research Institute（阿瑟·B·麦克唐纳加拿大高能天体粒子物理研究所）；Perimeter Institute for Theoretical Physics（理论物理前沿研究所）
Tidal disruption event rates across cosmic time: forecasts for LSST, Roman, and JWST and their constraints on the supermassive black hole mass function
Johns Hopkins University（约翰斯·霍普金斯大学）；University of Maryland, College Park（马里兰大学帕克分校）
Nanohertz Gravitational-Wave Constraints on Supermassive Binary Black Holes at Cosmic Dawn
Beijing Normal University（北京师范大学）；Curtin University（科廷大学）；Max Planck Institute for Gravitational Physics (Albert Einstein Institute)（马克斯·普朗克引力物理研究所（爱因斯坦研究所））；Leibniz Universität Hannover（汉诺威莱布尼茨大学）；Monash University（蒙纳士大学）；University of Melbourne（墨尔本大学）
Sombrero Galaxy as an Accelerator of Ultrahigh Energy Cosmic Ray Nuclei
Lehman College, City University of New York（纽约市立大学莱曼学院）；Graduate Center, City University of New York（纽约市立大学研究生中心）；American Museum of Natural History（美国自然历史博物馆）
Radiation hydrodynamic simulations for the origin of quasi-periodic oscillations for accretion onto supermassive black holes
National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；School of Astronomy and Space Sciences, University of Chinese Academy of Sciences（中国科学院大学天文与空间科学学院）；Key Laboratory of Computing Power Network and Information Security, Ministry of Education, Shandong Computer Science Center (National Supercomputing Center in Jinan), Qilu University of Technology (Shandong Academy of Sciences)（教育部计算网络与信息科学重点实验室，山东省计算中心（国家超级计算济南中心），齐鲁工业大学（山东省科学院））；Jinan Institute of Supercomputing Technology（济南超算技术研究所）；Department of Astronomy, Xiamen University（厦门大学天文学系）
Radiation and Magnetic Pressure Support in Accretion Disks around Supermassive Black Holes and The Physical Origin of the Extreme Ultraviolet to Soft X-ray Spectrum
Potential of Constraining Propagation Parameters of Galactic Cosmic Rays with the High Energy cosmic-Radiation Detection facility onboard China's Space Station
