Where to Search for Supermassive Binary Black Holes by Paola Marziani, Edi Bon, Natasa Bon, Mauro D’Onofrio

“…Supermassive binary black holes (SMBBHs) are the anticipated byproducts of galaxy mergers and play a pivotal role in shaping galaxy evolution, gravitational wave emissions, and accretion physics. …”
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Horizon fluxes of binary black holes in eccentric orbits by Sayak Datta

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Are Long Gamma-Ray Bursts Progenitors to Merging Binary Black Holes? by Tom Y. Wu, Maya Fishbach

“…The distribution of delay times between the formation of binary black hole (BBH) progenitors and their gravitational-wave (GW) merger provides important clues about their unknown formation histories. …”
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Coincident Multimessenger Bursts from Eccentric Supermassive Binary Black Holes by Vikram Manikantan, Vasileios Paschalidis, Gabriele Bozzola

“…Supermassive binary black holes are a key target for the future Laser Interferometer Space Antenna and excellent multimessenger sources across the electromagnetic (EM) spectrum. …”
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Survival of the Fittest: Testing Superradiance Termination with Simulated Binary Black Hole Statistics by Hui-Yu Zhu, Xi Tong, Giorgio Manzoni, Yanjiao Ma

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Exploring Field-evolution and Dynamical-capture Coalescing Binary Black Holes in GWTC-3 by Yin-Jie Li, Shao-Peng Tang, Shi-Jie Gao, Dao-Cheng Wu, Yuan-Zhu Wang

“…We investigate formation channels for merging binary black holes (BBHs) in GWTC-3, with a dedicated semiparametric population model. …”
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Relativistic Binary Precession: Impact on Eccentric Massive Binary Black Hole Accretion and Hydrodynamics by Stanislav DeLaurentiis, Zoltán Haiman, John Ryan Westernacher-Schneider, Luke Major Krauth, Jordy Davelaar, Jonathan Zrake, Andrew MacFadyen

“…Recent hydrodynamical simulations have shown that circumbinary gas disks drive the orbits of massive binary black holes (BHs) to become eccentric, even when general relativistic (GR) corrections to the orbit are significant. …”
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Dual Jet Interaction, Magnetically Arrested Flows, and Flares in Accreting Binary Black Holes by Sean M. Ressler, Luciano Combi, Bart Ripperda, Elias R. Most

“…Supermassive binary black holes in galactic centers are potential multimessenger sources in gravitational waves and electromagnetic radiation. …”
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The Use of Binary Black Holes Merging in Active Galactic Nuclei Disks for Hubble Constant Measurements by Guo-Peng Li, Xi-Long Fan

“…We study the impact of environmental effects on the measurement of the Hubble constant ( H _0 ) from gravitational-wave (GW) observations of binary black hole mergers residing in active galactic nuclei (AGNs) near the central supermassive black hole. …”
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The Heavier the Faster: A Subpopulation of Heavy, Rapidly Spinning and Quickly Evolving Binary Black Holes by Wei-Hua Guo, Yin-Jie Li, Yuan-Zhu Wang, Yong Shao, Shi-Chao Wu, Tao Zhu, Yi-Zhong Fan

“…The spins of binary black holes (BBHs) measured from gravitational waves contain valuable information about their formation pathways. …”
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Indication for a Compact Object Next to a LIGO–Virgo Binary Black Hole Merger by Shu-Cheng Yang, Wen-Biao Han, Hiromichi Tagawa, Song Li, Chen Zhang

“…The astrophysical origin of binary black hole (BBH) mergers remains uncertain, although many events have been observed by the LIGO–Virgo–KAGRA network. …”
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PyMerger: Detecting Binary Black Hole Mergers from the Einstein Telescope Using Deep Learning by Wathela Alhassan, T. Bulik, M. Suchenek

“…We present PyMerger , a Python tool for detecting binary black hole (BBH) mergers from the Einstein Telescope (ET), based on a deep residual neural network (ResNet) model. …”
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Spinning Spectral Sirens: Robust Cosmological Measurement Using Mass–Spin Correlations in the Binary Black Hole Population by Hui Tong, Maya Fishbach, Eric Thrane

“…We point out that binary black hole (BBH) spins, which are not redshifted in the detector frame, provide a natural way to identify robust mass scales for spectral siren cosmology. …”
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Anisotropy of Nanohertz Gravitational-wave Background and Source Clustering from Supermassive Binary Black Holes Based on Cosmological Simulation by Qing Yang, Xiao Guo, Zhoujian Cao, Xiaoyun Shao, Xi Yuan

“…Nanohertz GWs generated by supermassive binary black holes (SMBBHs) are one of the most important GW sources in the PTA band. …”
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Detection Rate of Galaxy Cluster-lensed Stellar Binary Black Hole Mergers by the Third-generation Gravitational-wave Detectors by Zhiwei Chen, Yushan Xie, Youjun Lu, Huanyuan Shan, Nan Li, Yuchao Luo, Xiao Guo

“…Gravitational waves (GWs) from stellar binary black hole (sBBH) mergers can be strongly gravitational lensed by intervening galaxies/galaxy clusters. …”
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Exploring the Evolution of Gravitational-wave Emitters with Efficient Emulation: Constraining the Origins of Binary Black Holes Using Normalizing Flows by Storm Colloms, Christopher P. L. Berry, John Veitch, Michael Zevin

“…Using current gravitational-wave observations of binary black holes, we use our trained normalizing flows to infer branching ratios between multiple formation channels, and simultaneously infer common-envelope efficiency and natal spins across a continuous parameter range. …”
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Not Just Winds: Why Models Find That Binary Black Hole Formation Is Metallicity-dependent, while Binary Neutron Star Formation Is Not by L. A. C. van Son, S. K. Roy, I. Mandel, W. M. Farr, A. Lam, J. Merritt, F. S. Broekgaarden, A. A. C. Sander, J. J. Andrews

“…Both detailed and rapid population studies alike predict that binary black hole (BHBH) formation is orders of magnitude more efficient at low metallicity than high metallicity, while binary neutron star (NSNS) formation remains mostly flat with metallicity, and black hole–neutron star mergers show intermediate behavior. …”
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Revealing the χeff–q Correlation among Coalescing Binary Black Holes and Tentative Evidence for AGN-driven Hierarchical Mergers by Yin-Jie Li, Yuan-Zhu Wang, Shao-Peng Tang, Tong Chen, Yi-Zhong Fan

“…The origin of the correlation between the effective spins ( χ _eff ) and mass ratios ( q ) of LIGO–Virgo–KAGRA’s binary black holes (BBHs) is still an open question. Motivated by the recent identification of two subpopulations of the BBHs, in this work we investigate the potential χ _eff – q correlation for each subpopulation. …”
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Compact Binary Formation in Open Star Clusters III: Probability of Binary Black Holes Hidden Inside of Gaia Black Hole Binary by Ataru Tanikawa, Long Wang, Michiko S. Fujii, Alessandro A. Trani, Toshinori Hayashi, Yasushi Suto

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The Origin Channels of Hierarchical Binary Black Hole Mergers in the LIGO–Virgo–KAGRA O1, O2, and O3 Runs by Guo-Peng Li, Xi-Long Fan

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