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We probe the intrinsic differences in simulated gravitational-wave signals from binary neutron star (BNS) mergers, arising from varying approaches to incorporating thermal effects in numerical-relativity modeling. We consider a hybrid…

General Relativity and Quantum Cosmology · Physics 2025-03-04 Miquel Miravet-Tenés , Davide Guerra , Milton Ruiz , Pablo Cerdá-Durán , José A. Font

Observations of the high-frequency gravitational waves (GWs) emitted by the hot and massive remnant of a binary neutron star merger will provide new probes of the dense-matter equation of state (EoS). We show that current uncertainties in…

High Energy Astrophysical Phenomena · Physics 2024-07-02 Carolyn A. Raithel , Vasileios Paschalidis

We present results from long-term, numerical-relativity simulations of binary neutron star mergers modeled using both, fully tabulated, finite-temperature, equations of state and their corresponding hybrid representations. The simulations…

General Relativity and Quantum Cosmology · Physics 2026-03-03 Davide Guerra , Milton Ruiz , Michele Pasquali , Pablo Cerdá-Durán , Arnau Rios , José A. Font

Binary neutron star mergers provide a unique probe of the dense-matter equation of state (EoS) across a wide range of parameter space, from the zero-temperature EoS during the inspiral to the high-temperature EoS following the merger. In…

High Energy Astrophysical Phenomena · Physics 2021-09-22 Carolyn Raithel , Vasileios Paschalidis , Feryal Özel

We provide the first comprehensive study of hyperons in neutron star mergers and quantify their specific impact. We discuss the thermal behavior of hyperonic equations of state~(EoSs) as a distinguishing feature from purely nucleonic models…

High Energy Astrophysical Phenomena · Physics 2024-02-09 Sebastian Blacker , Hristijan Kochankovski , Andreas Bauswein , Angels Ramos , Laura Tolos

We study the importance of the thermal behavior of the hadron-quark phase transition in neutron star (NS) mergers. To this end, we devise a new scheme approximating thermal effects to supplement any cold, barotropic hybrid equation of state…

High Energy Astrophysical Phenomena · Physics 2023-10-02 Sebastian Blacker , Andreas Bauswein , Stefan Typel

Parametric equations of state (EoSs) provide an important tool for systematically studying EoS effects in neutron star merger simulations. In this work, we perform a numerical validation of the M*-framework for parametrically calculating…

High Energy Astrophysical Phenomena · Physics 2022-09-14 Carolyn A. Raithel , Pedro Espino , Vasileios Paschalidis

An extended set of binary neutron star (NS) merger simulations is performed with an approximative conformally flat treatment of general relativity to systematically investigate the influence of the nuclear equation of state (EoS), the…

Astrophysics · Physics 2009-11-11 R. Oechslin , H. -T. Janka , A. Marek

The next generation of ground-based gravitational-wave detectors, Einstein Telescope (ET) and Cosmic Explorer (CE), present a unique opportunity to put constraints on dense matter, among many other groundbreaking scientific goals. In a…

General Relativity and Quantum Cosmology · Physics 2023-12-18 Francesco Iacovelli , Michele Mancarella , Chiranjib Mondal , Anna Puecher , Tim Dietrich , Francesca Gulminelli , Michele Maggiore , Micaela Oertel

Binary neutron star mergers probe the dense-matter equation of state (EoS) across a wide range of densities and temperatures, from the cold conditions of the inspiral to the high-temperature matter of the massive neutron star remnant. In…

High Energy Astrophysical Phenomena · Physics 2023-06-26 Carolyn A. Raithel , Vasileios Paschalidis

We study the influence of hyperons in binary neutron star (NS) mergers considering a total of 14 temperature dependent equations of state (EoSs) models which include hyperonic degrees of freedom and partly delta resonances. Thermally…

High Energy Astrophysical Phenomena · Physics 2025-06-03 Hristijan Kochankovski , Georgios Lioutas , Sebastian Blacker , Andreas Bauswein , Angels Ramos , Laura Tolos

We perform three-dimensional relativistic hydrodynamical calculations of neutron star mergers to assess the reliability of an approximate treatment of thermal effects in such simulations by combining an ideal-gas component with…

Solar and Stellar Astrophysics · Physics 2010-11-11 A. Bauswein , H. -Th. Janka , R. Oechslin

The dynamics in mergers of binary neutron star (BNS) systems depend sensitively on the equation of state (EOS) of dense matter. This has profound implications on the emission of gravitational waves (GWs) and the ejection of matter in the…

High Energy Astrophysical Phenomena · Physics 2023-12-22 Maximilian Jacobi , Federico Maria Guercilena , Sabrina Huth , Giacomo Ricigliano , Almudena Arcones , Achim Schwenk

Binary neutron star (BNS) post-merger gravitational-wave emission can occur in the aftermath of a BNS merger -- provided the system avoids prompt collapse to a black hole -- as a quasistable hypermassive remnant experiences quadrupolar…

We investigate the constraints on the neutron star equation of state (EoS) and nuclear properties achievable with third-generation gravitational wave detectors using the Fisher information matrix approach within the relativistic mean field…

High Energy Astrophysical Phenomena · Physics 2026-05-29 Zhenyu Zhu , Richard O'Shaughnessy

We present results from three-dimensional general relativistic simulations of binary neutron star coalescences and mergers using public codes. We considered equal mass models where the baryon mass of the two Neutron Stars (NS) is…

General Relativity and Quantum Cosmology · Physics 2016-08-09 Francesco Maione , Roberto De Pietri , Alessandra Feo , Frank Löffler

We systematically perform numerical-relativity simulations for equal-mass binary neutron star mergers for the models varying the thermal index $\Gamma_{\rm th}$ with three different equations of state (EOSs) of the neutron stars (NSs),…

High Energy Astrophysical Phenomena · Physics 2025-07-10 Ming-Zhe Han , Yong Gao , Kenta Kiuchi , Masaru Shibata

Gravitational waves from binary neutron star (BNS) mergers can constrain nuclear matter models predicting the neutron star's equation of state (EOS). Matter effects on the inspiral-merger signal are encoded in the multipolar tidal…

General Relativity and Quantum Cosmology · Physics 2023-02-09 Matteo Breschi , Gregorio Carullo , Sebastiano Bernuzzi

Next-generation gravitational wave (GW) observatories, such as the Einstein Telescope (ET) and Cosmic Explorer, will observe binary neutron star (BNS) mergers across cosmic history, providing precise parameter estimates for the closest…

We study the impact of finite-temperature effects in numerical-relativity simulations of binary neutron star mergers with microphysical equations of state and neutrino transport in which we vary the effective nucleon masses in a controlled…

High Energy Astrophysical Phenomena · Physics 2023-08-01 Jacob Fields , Aviral Prakash , Matteo Breschi , David Radice , Sebastiano Bernuzzi , André da Silva Schneider
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