General relativistic hydrodynamic simulations of binary strange star mergers

Grippa, Francesco; Prakash, Aviral; Logoteta, Domenico; Radice, David; Bombaci, Ignazio

doi:10.1103/physrevd.111.083009

General relativistic hydrodynamic simulations of binary strange star mergers

Journal Article · Fri Apr 04 00:00:00 EDT 2025 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.111.083009· OSTI ID:2548167

^[1]; ^[2]; ^[3]; ^[4]; ^[3]

Università degli Studi di Salerno (Italy); INFN, Sezione di Napoli, Salerno (Italy)
The Pennsylvania State University, University Park, PA (United States); University of California, Berkeley, CA (United States); University of New Hampshire, Durham, NH (United States)
Università di Pisa (Italy); INFN, Sezione di Pisa (Italy)
The Pennsylvania State University, University Park, PA (United States)

We perform fully general-relativistic simulations of binary strange star mergers considering two different approaches for thermal effects. The first uses a cold equation of state (EOS) derived from a modified version of the MIT bag model which is then supplemented by a Γ-law correction. The second approach employs a microphysical description of the finite-temperature effects. We describe results obtained with the two treatments, highlighting the influence of thermal effects. We find that the postmerger dynamics differs significantly in the two cases, leading to quantitative differences in the postmerger gravitational-wave spectrum and ejecta mass. The peak frequency of the postmerger gravitational-wave emission is consistent with the established quasi-universal relations for binary neutron star mergers and as a result, our simulations cannot distinguish between mergers of neutron stars and those of strange stars. Our models with realistic treatment of finite-temperature effects produce a significant amount of ejecta ≳0.02 M_⊙. Here, the resulting flux of strangelets near the Earth, computed assuming that all neutron star mergers are in fact strange-stars mergers and that the binary considered here is representative, is in tension with experimental upper limits. As such, our results tentatively disfavor a scenario in which strange-quark matter is the lowest energy state of matter.

View Accepted Manuscript (DOE)

Research Organization:: The Pennsylvania State University, University Park, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF)

Grant/Contract Number:: SC0021177; SC0024388; AC02-05CH11231

OSTI ID:: 2548167

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 8 Vol. 111; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Comprehensive Study of Mass Ejection and Nucleosynthesis in Binary Neutron Star Mergers Leaving Short-lived Massive Neutron Stars Fujibayashi, Sho; Kiuchi, Kenta; Wanajo, Shinya The Astrophysical Journal, Vol. 942, Issue 1 https://doi.org/10.3847/1538-4357/ac9ce0	journal	January 2023
GRMHD Simulations of Neutron-star Mergers with Weak Interactions: r-process Nucleosynthesis and Electromagnetic Signatures of Dynamical Ejecta Combi, Luciano; Siegel, Daniel M. The Astrophysical Journal, Vol. 944, Issue 1 https://doi.org/10.3847/1538-4357/acac29	journal	February 2023
Ab-initio General-relativistic Neutrino-radiation Hydrodynamics Simulations of Long-lived Neutron Star Merger Remnants to Neutrino Cooling Timescales Radice, David; Bernuzzi, Sebastiano The Astrophysical Journal, Vol. 959, Issue 1 https://doi.org/10.3847/1538-4357/ad0235	journal	December 2023
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Is the Compact Object Associated with HESS J1731-347 a Strange Quark Star? A Possible Astrophysical Scenario for Its Formation Di Clemente, Francesco; Drago, Alessandro; Pagliara, Giuseppe The Astrophysical Journal, Vol. 967, Issue 2 https://doi.org/10.3847/1538-4357/ad445b	journal	May 2024
General-relativistic Large-eddy Simulations of Binary Neutron Star Mergers Radice, David The Astrophysical Journal, Vol. 838, Issue 1 https://doi.org/10.3847/2041-8213/aa6483	journal	March 2017
Probing Extreme-density Matter with Gravitational-wave Observations of Binary Neutron Star Merger Remnants Radice, David; Bernuzzi, Sebastiano; Pozzo, Walter Del The Astrophysical Journal, Vol. 842, Issue 2 https://doi.org/10.3847/2041-8213/aa775f	journal	June 2017
Multi-messenger Observations of a Binary Neutron Star Merger Abbott, B. P.; Abbott, R.; Abbott, T. D. The Astrophysical Journal, Vol. 848, Issue 2 https://doi.org/10.3847/2041-8213/aa91c9	journal	October 2017
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Spiral-wave Wind for the Blue Kilonova Nedora, Vsevolod; Bernuzzi, Sebastiano; Radice, David The Astrophysical Journal, Vol. 886, Issue 2 https://doi.org/10.3847/2041-8213/ab5794	journal	November 2019
GW190814: Gravitational Waves from the Coalescence of a 23 Solar Mass Black Hole with a 2.6 Solar Mass Compact Object Abbott, R.; Abbott, T. D.; Abraham, S. The Astrophysical Journal, Vol. 896, Issue 2 https://doi.org/10.3847/2041-8213/ab960f	journal	June 2020
Emergence of Microphysical Bulk Viscosity in Binary Neutron Star Postmerger Dynamics Most, Elias R.; Haber, Alexander; Harris, Steven P. The Astrophysical Journal Letters, Vol. 967, Issue 1 https://doi.org/10.3847/2041-8213/ad454f	journal	May 2024

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79 ASTRONOMY AND ASTROPHYSICS
Astrophysical & cosmological simulations
Binary stars
Fluids & classical fields in curved spacetime
General relativity equations & solutions
Gravitational wave sources
Gravitational waves
Neutron stars & pulsars
Nuclear matter in neutron stars
Numerical relativity
Quantum chromodynamics
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