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We use the rapid binary stellar evolution code BINARY_C to estimate the rate of merging neutron stars with numerous combinations of envelope ejection efficiency and natal kick dispersion. We find a peak in the local rate of merging neutron…

High Energy Astrophysical Phenomena · Physics 2023-04-28 Alexander M. Tanaka , Avishai Gilkis , Robert G. Izzard , Christopher A. Tout

Extracting the unique information on ultradense nuclear matter from the gravitational waves emitted by merging, neutron-star binaries requires robust theoretical models of the signal. We develop a novel effective-one-body waveform model…

We calculate the gravitational radiation produced by the coalescence of inspiraling binary neutron stars in the Newtonian regime using 3-dimensional numerical simulations. The stars are modeled as polytropes and start out in the point-mass…

General Relativity and Quantum Cosmology · Physics 2011-09-09 Xing Zhuge , Joan M. Centrella , Stephen L. W. McMillan

We present the results of 3D, high-resolution calculations of neutron star mergers. Using Newtonian gravity, but adding the forces from the emission of gravitational waves, we solve the hydrodynamics equations using the smoothed particle…

Astrophysics · Physics 2016-02-09 S. Rosswog , M. B. Davies

Highly eccentric binary neutron star mergers exhibit unique dynamical and observational signatures compared to quasi-circular ones in terms of their gravitational wave signal and the ejection of matter, leading to different electromagnetic…

General Relativity and Quantum Cosmology · Physics 2025-04-15 Anna Neuweiler , Tim Dietrich , Bernd Brügmann

We investigate binary neutron star (BNS) mergers using general-relativistic numerical simulations with hadronic and hybrid equations of state (EOSs), incorporating the latest observations and theoretical constraints. We address two viable…

High Energy Astrophysical Phenomena · Physics 2025-09-16 Sudipta Hensh , Yong-Jia Huang , Toru Kojo , Luca Baiotti , Kentaro Takami , Shigehiro Nagataki , Hajime Sotani

Motivated by the possibility of observing gravitational waves from merging black holes whose spins are nearly extremal (i.e., 1 in dimensionless units), we present numerical waveforms from simulations of merging black holes with the highest…

General Relativity and Quantum Cosmology · Physics 2012-01-30 Geoffrey Lovelace , Michael Boyle , Mark A. Scheel , Bela Szilagyi

Recent breakthroughs in high repetition-rate extreme ultraviolet (XUV) light sources and photoelectron analyzers have led to dramatic advances in the performance of time-resolved photoemission experiments. In this perspective article, we…

Optics · Physics 2024-10-16 Thomas K. Allison , Alice Kunin , Gerd Schönhense

Using the \texttt{lalinference} Markov-chain Monte Carlo parameter estimation code, we examine two distinct nonprecessing black hole-neutron star (BH-NS) binaries with and without higher-order harmonics. Our simulations suggest that higher…

General Relativity and Quantum Cosmology · Physics 2014-03-26 R. O'Shaughnessy , B. Farr , E. Ochsner , Hee-Suk Cho , C. Kim , Chang-Hwan Lee

Currently there is great interest in the outcomes and astrophysical implications of mergers of double degenerate binaries. In a commonly adopted approximation, the components of such binaries are represented by polytropes with an index…

Solar and Stellar Astrophysics · Physics 2017-04-05 Patrick M Motl , Juhan Frank , Jan Staff , Geoffrey C Clayton , Christopher L Fryer , Wesley Even , Steven Diehl , Joel E Tohline

For the analysis of gravitational-wave signals, fast and accurate gravitational-waveform models are required. These enable us to obtain information on the system properties from compact binary mergers. In this article, we introduce the…

General Relativity and Quantum Cosmology · Physics 2024-07-17 Adrian Abac , Tim Dietrich , Alessandra Buonanno , Jan Steinhoff , Maximiliano Ujevic

We report the results of a first study that uses numerical simulations to estimate the accuracy with which one can use gravitational wave observations of double neutron star inspiral to measure parameters of the neutron-star equation of…

General Relativity and Quantum Cosmology · Physics 2010-04-14 Jocelyn S. Read , Charalampos Markakis , Masaru Shibata , Koji Uryu , Jolien D. E. Creighton , John L. Friedman

We present a time-domain model for the gravitational waves emitted by equal-mass binary neutron star merger remnants for a fixed equation of state. We construct a large set of numerical relativity simulations for a single equation of state…

High Energy Astrophysical Phenomena · Physics 2025-05-16 Theodoros Soultanis , Kiril Maltsev , Andreas Bauswein , Katerina Chatziioannou , Friedrich K. Roepke , Nikolaos Stergioulas

The gravitational waveform of merging binary neutron stars encodes information about extreme states of matter. Probing these gravitational emissions requires the gravitational-wave detectors to have high sensitivity above 1 kHz. Fortunately…

General Relativity and Quantum Cosmology · Physics 2018-09-12 Haixing Miao , Huan Yang , Denis Martynov

Mergers of black hole-neutron star (BHNS) binaries have now been observed by GW detectors with the recent announcement of GW200105 and GW200115. Such observations not only provide confirmation that these systems exist, but will also give…

We present an effective, low-dimensionality frequency-domain template for the gravitational wave signal from the stellar remnants from binary neutron star coalescence. A principal component decomposition of a suite of numerical simulations…

High Energy Astrophysical Phenomena · Physics 2016-04-13 James Alexander Clark , Andreas Bauswein , Nikolaos Stergioulas , Deirdre Shoemaker

The distance-inclination degeneracy limits gravitational-wave parameter estimation of compact binary mergers. Although the degeneracy can be partially broken by including higher-order modes or precession, these effects are suppressed in…

General Relativity and Quantum Cosmology · Physics 2023-02-13 Yiqi Xie , Deep Chatterjee , Gilbert Holder , Daniel E. Holz , Scott Perkins , Kent Yagi , Nicolás Yunes

Determining the equation of state of matter at nuclear density and hence the structure of neutron stars has been a riddle for decades. We show how the imminent detection of gravitational waves from merging neutron star binaries can be used…

General Relativity and Quantum Cosmology · Physics 2014-09-05 Kentaro Takami , Luciano Rezzolla , Luca Baiotti

We investigate tidal heating associated with the binary inspiral of strange quark stars and its impact on the resulting gravitational wave signal. Tidal heating during the merger of neutron stars composed of nuclear matter may be considered…

General Relativity and Quantum Cosmology · Physics 2025-10-30 Suprovo Ghosh , José Luis Hernández , Bikram Keshari Pradhan , Cristina Manuel , Debarati Chatterjee , Laura Tolos

We introduce a new numerical scheme for solving the initial value problem for quasiequilibrium binary neutron stars allowing for arbitrary spins. The coupled Einstein field equations and equations of relativistic hydrodynamics are solved in…

General Relativity and Quantum Cosmology · Physics 2009-11-10 Pedro Marronetti , Stuart L. Shapiro