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arXiv 1306.2175nucl-thastro-ph.HE
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中子和电荷中性β平衡核物质的铁磁性

Ferromagnetism in neutron and charge neutral beta-equilibrated nuclear matter

J. P. W. Diener, F. G. Scholtz

摘要:

利用重子和介子相互作用模型研究了无限中子物质以及β平衡、电荷中性、致密和无限核物质中的铁磁性。拉格朗日密度包含了磁场与粒子电荷之间的标准最小耦合以及重子偶极矩。相对于磁场的能量密度最小化产生铁磁场的自洽表达式。我们通过增加重子偶极矩的强度直到磁化物质的能量密度低于未磁化物质的能量密度来计算给定密度下的相边界。我们发现,根据密度,它是交叉时重子偶极矩增加了35倍。它对核物质参数化的细节也很敏感,穿过它会产生$\sim 10^{17}$高斯的磁场。

英文摘要:

Ferromagnetism in infinite neutron matter as well as beta equilibrated, charge neutral, dense, and infinite nuclear matter is investigated using a model of interacting baryons and mesons. The standard minimal couplings between the magnetic field and the particle charges as well as the baryon dipole moments are included in the Lagrangian density. Minimizing the energy density with respect to the magnetic field yields a self-consistent expression for the ferromagnetic field. We calculate the phase boundary at a given density by increasing the strength of the baryon dipole moments till the energy density of magnetized matter is lower than that of unmagnetized matter. We find that, depending on the density, it is crossed when the baryon dipole moments are increased by a factor of 35. It is also sensitive to the details of the nuclear matter parameterizations and crossing it induces a magnetic field of $\sim 10^{17}$ gauss.

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