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arXiv 1202.5016nucl-th
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强磁场作用下的超子中子星

Neutron Stars with Hyperons subject to Strong Magnetic Field

L. L. Lopes, D. P. Menezes

摘要:

中子星是宇宙中最奇特的天体之一,是研究核饱和密度以上的核物质的独特实验室。本文研究了强磁场作用下相对论模型中核物质的物态方程。然后,我们应用这个EoS研究和描述了中子星的一些物理特征,特别是质量-半径关系和化学成分。为了研究恒星内部的磁场和超子的影响,我们考虑了四种解:两种不同的磁场值,以获得一个弱的和一个强的影响,和两种配置:一个家庭的中子星形成的质子,电子和中子和家庭形成的质子,电子,中子,介子和超子。的限制和发现的结果的有效性进行了讨论与一些照顾。在所有情况下,构成中子星的粒子都处于$β$平衡状态,总净电荷为零。我们的工作表明,在描述磁星时必须考虑强磁场的影响,主要是如果我们相信它们的内部存在超子,在这种情况下,磁场的影响可以使质量增加10%以上。我们还看到,虽然磁星的质量可以达到2.48 $M_{\odot}$,但我们为什么不知道质量超过2.0 $M_{\odot}$的磁星,这是一个自然的解释。我们还讨论了磁场如何影响奇异分数在一些标准的中子星质量,总结我们的论文,我们重新访问的直接URCA过程相关的中子星的冷却,并显示它是如何受到超子和磁场。

英文摘要:

Neutron stars are one of the most exotic objects in the universe and a unique laboratory to study the nuclear matter above the nuclear saturation density. In this work, we study the equation of state of the nuclear matter within a relativistic model subjected to a strong magnetic field. We then apply this EoS to study and describe some of the physical characteristics of neutron star, especially the mass-radius relation and chemical compositions. To study the influence of a the magnetic field and the hyperons in the stellar interior, we consider altogether four solutions: two different values of magnetic field to obtain a weak and a strong influence, and two configurations: a family of neutron stars formed only by protons, electrons and neutrons and a family formed by protons, electrons, neutrons, muons and hyperons. The limit and the validity of the results found are discussed with some care. In all cases the particles that constitute the neutron star are in $β$ equilibrium and zero total net charge. Our work indicates that the effect of a strong magnetic field has to be taken into account in the description of magnetars, mainly if we believe that there are hyperons in their interior, in which case, the influence of the magnetic field can increase the mass by more than 10%. We have also seen that although a magnetar can reach 2.48$M_{\odot}$, a natural explanation of why we do not know pulsars with masses above 2.0$M_{\odot}$ arises. We also discuss how the magnetic field affects the strangeness fraction in some standard neutron star masses and, to conclude our paper, we revisit the direct URCA process related to the cooling of the neutron stars and show how it is affected by the hyperons and the magnetic 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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