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The discovery of the electromagnetic counterparts to the binary neutron star merger GW170817 has opened the era of GW+EM multi-messenger astronomy. Exploiting this breakthrough requires increasing samples to explore the diversity of…

We present new (3+1)D numerical relativity simulations of the binary neutron star (BNS) merger and postmerger phase. We focus on a previously inaccessible region of the binary parameter space spanning the binary's mass-ratio…

General Relativity and Quantum Cosmology · Physics 2017-02-01 Tim Dietrich , Maximiliano Ujevic , Wolfgang Tichy , Sebastiano Bernuzzi , Bernd Bruegmann

To date GW170817, produced by a binary neutron star (BNS) merger, is the only gravitational wave event with an electromagnetic (EM) counterpart. It was associated with a prompt short gamma-ray burst (GRB), an optical kilonova, and the…

Two neutron stars merge somewhere in the Universe approximately every 10 seconds, creating violent explosions observable in gravitational waves and across the electromagnetic spectrum. The transformative coincident gravitational-wave and…

High Energy Astrophysical Phenomena · Physics 2022-02-21 Nikhil Sarin , Paul D. Lasky

The pre-merger (early-warning) gravitational-wave (GW) detection and localization of a compact binary merger would enable astronomers to capture potential electromagnetic (EM) emissions around the time of the merger, thus shedding light on…

High Energy Astrophysical Phenomena · Physics 2022-04-06 Mukesh Kumar Singh , Divyajyoti , Shasvath J. Kapadia , Md Arif Shaikh , Parameswaran Ajith

Measuring the merger rate density history of binary neutron stars (BNS) can greatly aid in understanding the history of heavy element formation in the Universe. Currently, second-generation Gravitational Wave (GW) detectors can only measure…

High Energy Astrophysical Phenomena · Physics 2025-07-08 Yun-Fei Du , Emre Seyit Yorgancioglu , Shu-Xu Yi , Tian-Yong Cao , Shuang-Nan Zhang

Recent developments in deep learning techniques have offered an alternative and complementary approach to traditional matched filtering methods for the identification of gravitational wave (GW) signals. The rapid and accurate identification…

General Relativity and Quantum Cosmology · Physics 2024-11-06 Yu-Xin Wang , Shang-Jie Jin , Tian-Yang Sun , Jing-Fei Zhang , Xin Zhang

The observation of gravitational wave signals from binary black hole mergers has established the field of gravitational wave astronomy. It is expected that future networks of gravitational wave detectors will possess great potential in…

General Relativity and Quantum Cosmology · Physics 2018-06-06 Joseph Mills , Vaibhav Tiwari , Stephen Fairhurst

The merger of binary neutron star (BNS) systems are predicted to be progenitors of short gamma-ray bursts (GRBs); the definitive probe of this association came with the recent detection of gravitational waves (GWs) from a BNS merger by…

High Energy Astrophysical Phenomena · Physics 2018-06-06 Barbara Patricelli , Antonio Stamerra , Massimiliano Razzano , Elena Pian , Giancarlo Cella

The electromagnetic (EM) signal of a binary neutron star (BNS) merger depends sensitively on the total binary mass, $M_{\rm tot}$, relative to various threshold masses set by the neutron star (NS) equation-of-state (EOS), parameterized…

High Energy Astrophysical Phenomena · Physics 2019-07-31 Ben Margalit , Brian D. Metzger

We present the properties of NGC 4993, the host galaxy of GW170817, the first gravitational wave (GW) event from the merger of a binary neutron star (BNS) system and the first with an electromagnetic (EM) counterpart. We use both archival…

Gravitational waves (GWs) from binary neutron star (BNS) merger remnants complement constraints from the inspiral phase, mass-radius measurements, and microscopic theory by providing information about the neutron-star equation of state…

High Energy Astrophysical Phenomena · Physics 2025-09-24 Christian Ecker , Tyler Gorda , Aleksi Kurkela , Luciano Rezzolla

We present a proof-of-concept study, based on numerical-relativity simulations, of how gravitational waves (GWs) from neutron star merger remnants can probe the nature of matter at extreme densities. Phase transitions and extra degrees of…

High Energy Astrophysical Phenomena · Physics 2017-06-16 David Radice , Sebastiano Bernuzzi , Walter Del Pozzo , Luke F. Roberts , Christian D. Ott

Radio pulsar observations probe the lives of Galactic double neutron-star (DNS) systems while gravitational waves enable us to study extragalactic DNS in their final moments. By combining measurements from radio and gravitational-wave…

High Energy Astrophysical Phenomena · Physics 2021-04-09 Shanika Galaudage , Christian Adamcewicz , Xing-Jiang Zhu , Simon Stevenson , Eric Thrane

As of today, we have directly detected exactly one source in both gravitational waves (GWs) and electromagnetic (EM) radiation, the binary neutron star merger GW170817, its associated gamma-ray burst GRB170817A, and the subsequent kilonova…

High Energy Astrophysical Phenomena · Physics 2019-03-13 R. J. Foley , K. D. Alexander , I. Andreoni , I. Arcavi , K. Auchettl , J. Barnes , G. Baym , E. C. Bellm , A. M. Beloborodov , N. Blagorodnova , J. P. Blakeslee , P. R. Brady , M. Branchesi , J. S. Brown , N. Butler , M. Cantiello , R. Chornock , D. O. Cook , J. Cooke , D. L. Coppejans , A. Corsi , S. M. Couch , M. W. Coughlin , D. A. Coulter , P. S. Cowperthwaite , T. Dietrich , G. Dimitriadis , M. R. Drout , J. H. Elias , B. Farr , R. Fernandez , A. V. Filippenko , W. Fong , T. Fragos , D. A. Frail , W. L. Freedman , C. L. Fryer , V. Z. Golkhou , D. Hiramatsu , J. Hjorth , A. Horesh , G. Hosseinzadeh , K. Hotokezaka , D. A. Howell , T. Hung , D. O. Jones , V. Kalogera , D. Kasen , W. E. Kerzendorf , C. D. Kilpatrick , R. P. Kirshner , K. Krisciunas , J. M. Lattimer , D. Lazzati , A. J. Levan , A. I. MacFadyen , K. Maeda , I. Mandel , K. S. Mandel , B. Margalit , R. Margutti , J. McIver , B. D. Metzger , K. Mooley , T. Moriya , A. Murguia-Berthier , G. Narayan , M. Nicholl , S. Nissanke , K. Nomoto , J. M. O'Meara , R. O'Shaughnessy , E. O'Connor , A. Palmese , Y. -C. Pan , C. Pankow , K. Paterson , D. A. Perley , R. Perna , A. L. Piro , T. A. Pritchard , E. Quataert , D. Radice , E. Ramirez-Ruiz , S. Reddy , A. Rest , A. G. Riess , C. L. Rodriguez , C. Rojas-Bravo , E. M. Rossi , S. Rosswog , M. Ruiz , S. L. Shapiro , D. H. Shoemaker , M. R. Siebert , D. M. Siegel , K. Siellez , N. Smith , M. Soares-Santos , N. B. Suntzeff , R. Surman , M. Tanaka , N. R. Tanvir , G. Terreran , S. Valenti , V. A. Villar , L. Wang , S. A. Webb , J. C. Wheeler , P. K. G. Williams , S. Woosley , M. Zaldarriaga , M. Zevin

Next-generation detectors are expected to be sensitive to postmerger signals from binary neutron star coalescences and thus to directly probe the remnant dynamics. We investigate the scientific potential of postmerger detections with the…

General Relativity and Quantum Cosmology · Physics 2022-05-23 Matteo Breschi , Rossella Gamba , Ssohrab Borhanian , Gregorio Carullo , Sebastiano Bernuzzi

Explaining gravitational-wave (GW) observations of binary neutron star (BNS) mergers requires an understanding of matter beyond nuclear saturation density. Our current knowledge of the properties of high-density matter relies on…

High Energy Astrophysical Phenomena · Physics 2024-03-15 Giuseppe Rivieccio , Davide Guerra , Milton Ruiz , José A. Font

Multimessenger signals from binary neutron star (BNS) mergers are promising tools to infer the largely unknown properties of nuclear matter at densities that are presently inaccessible to laboratory experiments. The gravitational waves…

High Energy Astrophysical Phenomena · Physics 2025-02-17 Christian Ecker , Tyler Gorda , Aleksi Kurkela , Luciano Rezzolla

Neutron star mergers are among the most promising sources of gravitational waves for advanced ground-based detectors. These mergers are also expected to power bright electromagnetic signals, in the form of short gamma-ray bursts,…

Future ground-based gravitational wave (GW) detectors, i.e., Einstein telescope (ET) and Cosmic Explorer (CE), are expected to detect a significant number of lensed binary neutron star (BNS) mergers, which may provide a unique tool to probe…

High Energy Astrophysical Phenomena · Physics 2023-07-07 Hao Ma , Youjun Lu , Xiao Guo , Siqi Zhang , Qingbo Chu