标题： 核物质中声速的上限来自输运 显示英文标题

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

摘要： 我们指出，存在一个声速平方的上限，由$c_s^2 \leq 0.781$给出，适用于所有由相对论瞬态流体力学描述的已知系统，在这些系统中可以从第一性原理计算某些流体力学输运系数的比值。 假设这一界限适用于超致密物质，则意味着孤立（非旋转）中子星的最大质量不能超过2.7个太阳质量。 显示英文摘要

摘要： 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.