Neutron Star Merger Remnants

Abstract

Binary neutron star mergers observations are a unique way to constrain fundamental physics and astrophysics at the extreme. The interpretation of gravitational-wave events and their electromagnetic counterparts crucially relies on general-relativistic models of the merger remnants. Quantitative models can be obtained only by means of numerical relativity simulations in 3+1 dimensions including detailed input physics for the nuclear matter, electromagnetic and weak interactions. This review summarizes the current understanding of merger remnants focusing on some of the aspects that are relevant for multimessenger observations.

arXiv comment40 pages, 9 figures, 305 references. Invited review for the Topical Collection on Binary Neutron Star mergers of the journal General Relativity and Gravitation. Fixed few references

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• Turbulence modelling in neutron star merger simulations
• Evolution of equal mass binary bare quark stars in full general relativity: could a supramassive merger remnant experience prompt collapse?
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• Modeling kilonova afterglows: Effects of the thermal electron population and interaction with GRB outflows
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• Geometric and thermodynamic characterization of binary neutron star accretion discs
• Effects of nuclear matter properties in neutron star mergers
• The puzzling long GRB 191019A: Evidence for Kilonova Light
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• The physics of non-ideal general relativistic magnetohydrodynamics
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• Synthetic radio images of structured GRB and kilonova afterglows
• On the Testability of the Quark-Hadron Transition Using Gravitational Waves From Merging Binary Neutron Stars
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