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arXiv 1705.08641astro-ph.HE
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强磁场下中子星壳核转变的对称能和温度效应

Crust-core transition of a neutron star: effects of the symmetry energy and temperature under strong magnetic fields

Jianjun Fang, Helena Pais, Sagar Pratapsi, Contança Providência

摘要:

研究了对称能和温度对磁星壳核相变的同时影响。在相对论平均场方法中,动力学和物理旋节线被用来计算物态方程的过渡区。考虑了强度在$ 2\times 10^{15}<B<5\times 10 ^{16}$ G范围内的量子化磁场。在这些强磁场作用下,地壳的伸展对对称能的密度依赖性非常敏感,并且依赖于地壳厚度的性质可以对状态方程设置约束。结果表明,当温度高于$10^{9}$ K时,壳核转变的影响被消除。然而,对于低于该值的温度,存在一个明显的影响,随着温度的降低而增加,在研究磁星的演化时应该考虑到这一点。

英文摘要:

We study the simultaneous effects of the symmetry energy and temperature on the crust-core transition of a magnetar. The dynamical and the thermodynamical spinodals are used to calculate the transition region within a relativistic mean-field approach for the equation of state. Quantizing magnetic fields with intensities in the range of $ 2\times 10^{15}<B<5\times 10 ^{16}$G are considered. Under these strong magnetic fields, the crust extension is very sensitive to the density dependence of the symmetry energy, and the properties that depend on the crust thickness could set a constraint on the equation of state. It is shown that the effect on the extension of the crust-core transition is washed out for temperatures above $10^{9}$ K. However, for temperatures below that value, a noticeable effect exists that grows as the temperature decreases and which should be taken into account when the evolution of magnetars is studied.

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