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arXiv 1012.5970astro-ph.HE
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强量子化磁场中中子星的内壳

Inner crusts of neutron stars in strongly quantising magnetic fields

Rana Nandi, Debades Bandyopadhyay, Igor N. Mishustin, Walter Greiner

摘要:

我们研究了中子星内壳核在强磁场$\sim 10^{17}$存在下的性质和稳定性。原子核与中子气体共存,并存在于地壳内部均匀的电子气体中。这个问题的研究范围内的M-Fermi模型。我们基于Bonche、Levit和Vautherin的减法程序提取核的性质。由于在强磁场存在下的朗道量子化的电子的相空间修改导致在较低密度$\sim 0.001$ fm $^{-3}$下电子和质子分数的增强。我们找到了平衡核在每个平均重子密度通过最小化的自由能,并表明,在强磁场的存在下,它是低于在无场的情况下。与零场情况相比,在强磁场中,包围着核以及中子和电子气体的球形晶胞的尺寸变得更小。与零场情况相比,在强磁场存在下得到了更大质量和原子序数的核。

英文摘要:

We study the properties and stability of nuclei in the inner crust of neutron stars in the presence of strong magnetic fields $\sim 10^{17}$ G. Nuclei coexist with a neutron gas and reside in a uniform gas of electrons in the inner crust. This problem is investigated within the Thomas-Fermi model. We extract the properties of nuclei based on the subtraction procedure of Bonche, Levit and Vautherin. The phase space modification of electrons due to Landau quantisation in the presence of strong magnetic fields leads to the enhancement of electron as well as proton fractions at lower densities $\sim 0.001$ fm$^{-3}$. We find the equilibrium nucleus at each average baryon density by minimising the free energy and show that, in the presence of strong magnetic fields, it is lower than that in the field free case. The size of the spherical cell that encloses a nucleus along with the neutron and electron gases becomes smaller in strong magnetic fields compared with the zero field case. Nuclei with larger mass and atomic numbers are obtained in the presence of strong magnetic fields as compared with cases of zero field.

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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