Pith. sign in

REVIEW 4 cited by

Simulating bulk viscosity in neutron stars. I. Formalism

Not yet reviewed by Pith; the record is open.

Re-run · record.json Download PDF Read on arXiv ↗

This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.

SPECIMEN: schema-true, not a live event

T0 review · schema-true

One-sentence machine reading of the paper's core claim.

pith:XXXXXXXX · record.json · timestamp

arxiv 2204.11809 v2 pith:XDSFR4B3 submitted 2022-04-25 gr-qc astro-ph.HE

Giovanni Camelio , Lorenzo Gavassino , Marco Antonelli , Sebastiano Bernuzzi , Brynmor Haskell This is my paper · ORCID
classification gr-qcastro-ph.HE
keywords neutronbulkfluidthreeviscosityapproacheschemicaldiscuss
verification ladder T0 review T1 audit T2 compute T3 formal

Signed reviews

No signed human review yet.

0 comments
read the original abstract

The faithful inclusion of the effects of bulk viscosity induced by the presence of chemical reactions is an important issue for simulations of core-collapse supernovae, binary neutron star mergers, and neutron star oscillations, where particle abundances are locally pushed out of chemical equilibrium by rarefaction and compression of the fluid elements. In this work, we discuss three different approaches that can be used to implement bulk viscosity in general relativistic hydrodynamic simulations of neutron stars: the exact multi-component reacting fluid, and two M\"uller-Israel-Stewart theories, namely the second order Hiscock-Lindblom model and its linear limit, the Maxwell-Cattaneo model. After discussing the theory behind the three approaches, we specialize their dynamics equations to spherical symmetry in the radial gauge-polar slicing (i.e., Schwarzschild) coordinates. We also discuss a particular choice for the equation of state of the fluid and the associated neutrino emission rates, which are used in a companion paper for the numerical comparison of the three frameworks, and we obtain the effective sound speed for the Hiscock-Lindblom theory in the non-linear regime.

Discussion (0). Continue with ORCID to comment.

Forward citations

Cited by 4 Pith papers

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

  1. Causality constraints on radiative transfer

    nucl-th 2025-02 conditional novelty 8.0 of 10

    Including the finite travel time of photons fixes the acausal instability of Spiegel's radiative transfer formula and yields exact, hydrohedron-compatible transport coefficients.

  2. Extending Israel-Stewart theory: Causal bulk viscosity at large gradients

    gr-qc 2025-01 accept novelty 8.0 of 10

    A new family of polytropic bulk-viscous fluids reduces to Israel-Stewart near equilibrium and stays causal, symmetric hyperbolic, and thermodynamically consistent for arbitrarily large viscous stresses.

  3. Perturbations of relativistic dissipative stars

    gr-qc 2024-11 conditional novelty 7.0 of 10

    Linearized perturbations of relativistic stars with BDNK viscosity reduce to two coupled wave equations in the axial sector and five coupled wave equations plus a constraint in the polar sector, including a new viscous mode.

  4. TTE-CAM: Self-Explainable Class Activation Maps for Pretrained Black-Box CNNs

    cs.CV 2026-03 unverdicted novelty 5.0 of 10

    A test-time convolution-head replacement converts pretrained CNNs into self-explainable models that keep black-box accuracy and produce faithful class activation maps.

Pith tools