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arXiv 2202.05595nucl-thastro-ph.HE
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强磁场下中子星中的Pasta相

Pasta phases in neutron stars under strong magnetic fields

Xiaopeng Wang, Jing Li, Jianjun Fang, Helena Pais, Constança Providência

摘要:

在目前的工作中,我们考虑在相对论平均场描述的框架内的强磁场的存在下,在中子星的地壳最内层的核物质。为了讨论状态方程对地壳结构的密度依赖性,考虑了两种对称能斜率不同的模型。用共存相方法描述了$β$平衡态中的非均匀物质,并讨论了包含反常磁矩的影响。五个不同的几何形状的面食结构被认为是。结果表明,强磁场引起中子星的内壳的扩展,与一个存在于零磁场的一个以上的一系列断开的非均匀物质区域的出现。此外,我们观察到,在这些不连续的区域中,对于某些值的磁场,所有五种不同的团簇几何形状发生,气体密度接近团簇密度。此外,中子星壳核过渡处的压力比零磁场下的压力大得多。强磁场存在的另一个显著影响是质子分数的增加,有利于质子在气体背景中的出现。

英文摘要:

In the present work, we consider nuclear matter in the innermost crust of neutron stars under the presence of a strong magnetic field within the framework of a relativistic mean-field description. Two models with a different slope of the symmetry energy are considered in order to discuss the density-dependence of the equation of state on the crust structure. The non-homogeneous matter in $β$-equilibrium is described within the coexisting phases method, and the effect of including the anomalous magnetic moment is discussed. Five different geometries for the pasta structures are considered. It is shown that strong magnetic fields cause an extension of the inner crust of the neutron stars, with the occurrence of a series of disconnected non-homogeneous matter regions above the one existing for a null magnetic field. Moreover, we observed that in these disconnected regions, for some values of the magnetic field, all five different cluster geometrical shapes occur, and the gas density is close to the cluster density. Also, the pressure at the neutron star crust-core transition much larger than the pressure obtained for a zero magnetic field. Another noticeable effect of the presence of strong magnetic fields is the increase of the proton fraction, favoring the appearance of protons in the gas background.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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