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Upper Bound on the Speed of Sound in Nuclear Matter from Transport

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arxiv 2402.14085 v1 pith:GORJDLYW submitted 2024-02-21 nucl-th astro-ph.HEhep-ph

Mauricio Hippert , Jorge Noronha , Paul Romatschke This is my paper · ORCID
classification nucl-thastro-ph.HEhep-ph
keywords boundmattersoundspeedtransportuppervalidassuming
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abstract

We point out that there is an upper bound on the speed of sound squared given by $c_s^2 \leq 0.781$ valid for all known systems described by relativistic transient hydrodynamics where calculations of certain ratios of hydrodynamic transport coefficients can be performed from first principles. Assuming this bound is valid for ultradense matter implies that the maximum mass of isolated (non-rotating) neutron stars cannot be larger than 2.7 solar masses.

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Forward citations

Cited by 5 Pith papers

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

  1. The Lorentzian geometry of relaxation

    nucl-th 2026-07 accept novelty 8.0 of 10

    Causality forces purely relaxational dispersion relations to follow spacelike trajectories on the Lorentzian {iω,ik} plane, producing universal bounds on diffusivity, viscosity, time-dilation deviations, and hydrodyna...

  2. 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.

  3. Dense QC$_2$D. What's up with that?!?

    hep-lat 2024-12 conditional novelty 4.0 of 10

    On a finer lattice than previous studies, the speed of sound in dense two-color QCD again rises above the conformal bound near the superfluid transition.

  4. Novel Scalings of Neutron Star Properties from Analyzing Dimensionless Tolman--Oppenheimer--Volkoff Equations

    astro-ph.HE 2025-01 reject novelty 3.0 of 10

    IPAD-TOV is a perturbative analysis of dimensionless TOV equations yielding claimed EOS-model-independent scalings and a bound X=Pc/εc≤0.374, used to extract central EOS from NS observations.

  5. Phase and equation of state of finite density QC$_2$D at lower temperature

    hep-lat 2024-12 conditional novelty 2.0 of 10

    Proceedings summarizing lattice QC2D results: the conformal bound c_s^2/c^2 = 1/3 is exceeded in the BCS phase at T = 40 and 80 MeV, with a rich hadronic/BEC/BCS phase structure.

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