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Upper Bound on the Speed of Sound in Nuclear Matter from Transport
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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.
Forward citations
Cited by 2 Pith papers
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The Lorentzian geometry of relaxation
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...
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Including the finite travel time of photons fixes the acausal instability of Spiegel's radiative transfer formula and yields exact, hydrohedron-compatible transport coefficients.
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