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

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arxiv 2407.12493 v2 pith:3W4UKU3Y submitted 2024-07-17 nucl-th astro-ph.HEhep-ph

Mark Alford , Arus Harutyunyan , Armen Sedrakian , Stefanos Tsiopelas This is my paper · ORCID
classification nucl-thastro-ph.HEhep-ph
keywords quarkmatterbulkquarksviscositybluecolordamping
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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.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Neutrino absorption in two-flavor color-superconducting quark matter

    nucl-th 2025-09 conditional novelty 7.0 of 10

    In 2SC quark matter, neutrino absorption is dominated by strange-quark capture at low temperature, and a degenerate neutrino gas at electron lepton fraction 0.1 has a mean free path of meters or less.

  2. Building Neutron Stars with the MUSES Calculation Engine

    nucl-th 2025-02 conditional novelty 6.0 of 10

    A new open-source calculation engine produces crust-to-core neutron star equations of state and shows that smooth matching choices change predicted radii and masses by several percent.

  3. Nuclear matter equation of state and astrophysics

    nucl-th 2026-07 conditional

    A review of multimessenger constraints on the neutron-star equation of state, arguing composition remains undetermined and advocating a multidimensional EoS framework and the author-affiliated MUSES software.

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