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There is some weak evidence that the black hole merger named GW190521 had a non-zero eccentricity.
Hierarchical Black Hole Mergers in Active Galactic Nuclei
Yang, Y. et al · 1906
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Effect of distant encounters on black hole binaries in globular clusters: Systematic increase of in-cluster mergers in the LISA band
Samsing, J., Hamers, A. S. & Tyles, J. G · 1906
Earlier work this paper cites.
A statistical solution to the chaotic, non-hierarchical three-body problem
Stone, N. C. & Leigh, N. W. C · 1909
Earlier work this paper cites.
Formation and Evolution of Compact-object Binaries in AGN Disks
Tagawa, H., Haiman, Z. & Kocsis, B · 1912
Earlier work this paper cites.
Gravitational Radiation and the Motion of Two Point Masses
Peters, P · 1964
Earlier work this paper cites.
Binary evolution in stellar dynamics
Heggie, D. C · 1975
Earlier work this paper cites.
A statistical theory of the disruption of three-body systems - II. High angular momentum
Monaghan, J. J · 1976
Earlier work this paper cites.
Dynamical Friction in a Gaseous Medium
Ostriker, E. C · 1999
Earlier work this paper cites.
Formation of massive stars and black holes in self-gravitating AGN discs, and gravitational waves in LISA band
Levin, Y · 2003
Earlier work this paper cites.
Spin Evolution of Stellar-mass Black Hole Binaries in Active Galactic Nuclei
Tagawa, H., Haiman, Z., Bartos, I. & Kocsis, B · 2004
Earlier work this paper cites.
Radiation Pressure-supported Starburst Disks and Active Galactic Nucleus Fueling
Thompson, T. A., Quataert, E. & Murray, N · 2005
Earlier work this paper cites.
Detection Rate Estimates of Gravity Waves Emitted during Parabolic Encounters of Stellar Black Holes in Globular Clusters
Kocsis, B., Gáspár, M. E. & Márka, S · 2006
Earlier work this paper cites.
Candidate Electromagnetic Counterpart to the Binary Black Hole Merger Gravitational-Wave Event S190521g ∗
Graham, M. J. et al · 2006
Earlier work this paper cites.
Gravitational Radiation from Post-Newtonian Sources and Inspiralling Compact Binaries
Blanchet, L · 2006
Cited alongside, same era.
The Three-Body Problem (2006)
Valtonen, M. & Karttunen, H · 2006
Cited alongside, same era.
Dynamical Friction of a Circular-Orbit Perturber in a Gaseous Medium
Kim, H. & Kim, W.-T · 2007
Cited alongside, same era.
GW190521 as a Highly Eccentric Black Hole Merger
Gayathri, V. et al · 2009
Cited alongside, same era.
GW190521: Orbital Eccentricity and Signatures of Dynamical Formation in a Binary Black Hole Merger Signal
Romero-Shaw, I., Lasky, P. D., Thrane, E. & Calderón Bustillo, J · 2009
Cited alongside, same era.
On the rate of black hole binary mergers in galactic nuclei due to dynamical hardening
Leigh, N. W. C. et al · 2018
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Post-Newtonian dynamics in dense star clusters: Formation, masses, and merger rates of highly-eccentric black hole binaries
Rodriguez, C. L. et al · 2018
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Eccentric black hole mergers forming in globular clusters
Samsing, J · 2018
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Black Hole Mergers From Globular Clusters Observable by LISA I: Eccentric Sources Originating From Relativistic N-body Dynamics
Samsing, J. & D’Orazio, D. J · 2018
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Dissipative Evolution of Unequal-mass Binary-single Interactions and Its Relevance to Gravitational-wave Detections
Samsing, J., MacLeod, M. & Ramirez-Ruiz, E · 2018
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Cantiello, M., Jermyn, A. S. & Lin, D. N. C · 2009
Cited alongside, same era.
Romero-Shaw, I. M., Lasky, P. D., Thrane, E. & Calderon Bustillo, J · 2009
Cited alongside, same era.
Intermediate mass black holes in AGN discs - I. Production and growth
McKernan, B., Ford, K. E. S., Lyra, W. & Perets, H. B · 2012
Cited alongside, same era.
The Formation of Eccentric Compact Binary Inspirals and the Role of Gravitational Wave Emission in Binary-Single Stellar Encounters
Samsing, J., MacLeod, M. & Ramirez-Ruiz, E · 2014
Cited alongside, same era.
Rapid and Bright Stellar-mass Binary Black Hole Mergers in Active Galactic Nuclei
Bartos, I., Kocsis, B., Haiman, Z. & Márka, S · 2017
Cited alongside, same era.
Assisted inspirals of stellar mass black holes embedded in AGN discs: solving the ‘final au problem’
Stone, N. C., Metzger, B. D. & Haiman, Z · 2017
Cited alongside, same era.
Formation of Tidal Captures and Gravitational Wave Inspirals in Binary-single Interactions
Samsing, J., MacLeod, M. & Ramirez-Ruiz, E · 2017
Cited alongside, same era.
MOCCA-SURVEY Database. I. Eccentric Black Hole Mergers during Binary-Single Interactions in Globular Clusters
Samsing, J., Askar, A. & Giersz, M · 2018
Later among the works it cites.
Orbital Migration of Interacting Stellar Mass Black Holes in Disks around Supermassive Black Holes
Secunda, A. et al · 2019
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Measurement Accuracy of Inspiraling Eccentric Neutron Star and Black Hole Binaries Using Gravitational Waves
Gondán, L. & Kocsis, B · 2019
Later among the works it cites.
Eccentric Black Hole Mergers in Dense Star Clusters: The Role of Binary-Binary Encounters
Zevin, M., Samsing, J., Rodriguez, C., Haster, C.-J. & Ramirez-Ruiz, E · 2019
Later among the works it cites.
Properties and astrophysical implications of the 150 m ⊙ \odot binary black hole merger GW190521
Abbott, R. et al · 2020
Closest in time.
GW190521: A Binary Black Hole Merger with a Total Mass of 150 M ⊙
Abbott, R., Abbott, T. D., Abraham, S. et al · 2020
Closest in time.
Illuminating Black Hole Binary Formation Channels with Spins in Advanced LIGO
Rodriguez, C. L., Zevin, M., Pankow, C., Kalogera, V. & Rasio, F. A · 2020
Closest in time.
Li, Y.-P., Dempsey, A. M., Li, S., Li, H. & Li, J · 2021
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