论文标题
在中子恒星中绑定的声速上
On the sound velocity bound in neutron stars
论文作者
论文摘要
在文献中已经提出，核物质的声速$ v_s $违反了高密度下的所谓声速绑定$ v_s \ le c/\ le c/\ sqrt {3} $，其中$ c $是光速。在本文中，我们重新审视了这个问题，并面对当前的质量，半径和潮汐恒星的潮气可变形性，其中性恒星具有$ 10^5 $不同的状态方程，这些状态在低密度下进行了参数，并使声音速度限制为超过两倍的饱和密度，而状态方程的属性则可以保守，并且中等程度的质量可以保守元素。声速绑定。我们发现，大多数模型被与观测值的不兼容所消除，尤其是最近检测到的大量脉冲星（$ 2.35 \ pm 0.17 m_ \ odot $）几乎无法通过我们的模拟来实现。我们的研究强烈支持违反声音速度结合的行为。
It has been suggested in the literature that the sound velocity of the nuclear matter $v_s$ violates the so-called sound velocity bound $v_s \le c/\sqrt{3}$ at high density, where $c$ is the speed of light. In this paper, we revisit this issue and confront the current measurements of mass, radius, and tidal deformability of neutron stars with $10^5$ different equations of state which are parametrized at low density and saturates the sound velocity bound beyond twice the saturation density where the equation of state has not been constrained yet, by which we can conservatively obtain the maximum mass of the neutron stars compatible both with the observed properties of neutron stars and the sound velocity bound. We find that majority of the models are eliminated by the incompatibility with the observations and, especially, the recently detected massive pulsar ($2.35\pm 0.17 M_\odot$) is hardly realized by our simulations. Our study strongly supports the violation of the sound velocity bound.
