Bulk viscosity of two-color superconducting quark matter in neutron star mergers

Abstract

We study the bulk viscosity of moderately hot and dense, neutrino-transparent color superconducting quark matter arising from weak-interaction-driven direct URCA processes. The quark matter is modeled using the Nambu--Jona-Lasinio model improved to account for vector and 't Hooft interactions as well as antisymmetric pairing among the red/green up and down quarks. The unpaired excitations are the strange quarks and the blue up or down quarks. We compute the relaxation rates associated with $d$ and $s$-quark decay and electron capture processes on $u$ quark for blue color. The resulting bulk viscosity for density oscillations in the 1--10\,kHz range shows a resonant peak at $T\sim 5\,\MeV$, and the damping time may drop below 10 ms. This is short enough to affect the postmerger evolution and is very similar to the damping predicted in nuclear matter.

arXiv commentv2: 6 pages + 4 figures main text, 2 pages + 2 figures supplemental material. Matches version published in Phys. Rev. D. Letters

References in corpus (26)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Color superconductivity in dense quark matter
• Binary neutron-star mergers: a review of Einstein's richest laboratory
• Identifying a first-order phase transition in neutron star mergers through gravitational waves
• Binary Neutron Star Mergers
• Composition and stability of hybrid stars with hyperons and quark color-superconductivity
• On the importance of viscous dissipation and heat conduction in binary neutron-star mergers
• Gravitational waves from neutron star mergers and their relation to the nuclear equation of state
• Anisotropic Hydrodynamics, Bulk Viscosities and R-Modes of Strange Quark Stars with Strong Magnetic Fields
• Damping of density oscillations in neutrino-transparent nuclear matter
• Bulk Viscosity in Hybrid Stars
• Direct Urca neutrino rate in colour superconducting quark matter
• Bulk viscosity of strange quark matter: Urca versus non-leptonic processes
• Strangeness-changing Rates and Hyperonic Bulk Viscosity in Neutron Star Mergers
• Bulk viscosity in 2SC quark matter
• Bulk viscosity of spin-one color superconductors with two quark flavors
• Ab-Initio General-Relativistic Neutrino-Radiation Hydrodynamics Simulations of Long-Lived Neutron Star Merger Remnants to Neutrino Cooling Timescales
• Bulk viscosity from Urca processes: $npe\mu$ matter in the neutrino-trapped regime
• Formulating bulk viscosity for neutron star simulations
• Bulk viscosity of spin-one color superconducting strange quark matter
• Estimate for the bulk viscosity of strongly coupled quark matter using perturbative QCD and holography
• Bulk viscosity from Urca processes: $npe\mu$ matter in the neutrino-transparent regime
• Turbulence modelling in neutron star merger simulations
• Neutrino emissivity and bulk viscosity of iso-CSL quark matter in neutron stars
• Damping of density oscillations from bulk viscosity in quark matter
• Non-leptonic weak processes in spin-one color superconducting quark matter

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• Effect of Magnetic Fields on Urca Rates in Neutron Star Mergers
• Tidal dissipation in binary neutron star inspirals from hyperon bulk viscosity: Phase modeling and parameter estimation bias
• Suppression of composition $g$-modes in chemically-equilibrating warm neutron stars
• Burgers equation for the bulk viscous pressure of quark matter
• Bulk Viscosity of Two-Flavor Color Superconducting Quark Matter in Neutron Star Mergers
• Isentropic hybrid stars in the Nambu-Jona-Lasinio model: effects of neutrino trapping