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arXiv 1407.3799hep-thastro-ph.SRgr-qcnucl-th
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作为中子星的BPS Skyrmions

BPS Skyrmions as neutron stars

C. Adam, C. Naya, J. Sanchez-Guillen, R. Vazquez, A. Wereszczynski

摘要:

BPS Skyrme模型已经被证明提供了一个物理上有趣的和定量上可靠的核物质的描述。事实上,该模型既具有对称性,又具有理想流体的能量-动量张量,因此代表了核物质的“液滴”模型的场论实现。此外,经典孤子解加上一些明显的修正(自旋-同位旋量子化,库仑能量,质子-中子质量差),为更重的核提供了一个精确的核结合能模型。这些结果导致了一个相当自然的建议,试图用与引力耦合的BPS Skyrme模型来描述中子星。我们发现,当模型参数值从核物理中提取时,所得到的自引力BPS Skyrmions为描述中子星的体性质提供了极好的结果和一些新的视角.具体地说,在黑洞形成之前,中子星的最大可能质量是几个太阳质量,精确值取决于模型参数的精确值,由此产生的中子星半径约为10公里。

英文摘要:

The BPS Skyrme model has been demonstrated already to provide a physically intriguing and quantitatively reliable description of nuclear matter. Indeed, the model has both the symmetries and the energy-momentum tensor of a perfect fluid, and thus represents a field theoretic realization of the "liquid droplet" model of nuclear matter. In addition, the classical soliton solutions together with some obvious corrections (spin-isospin quantization, Coulomb energy, proton-neutron mass difference) provide an accurate modeling of nuclear binding energies for heavier nuclei. These results lead to the rather natural proposal to try to describe also neutron stars by the BPS Skyrme model coupled to gravity. We find that the resulting self-gravitating BPS Skyrmions provide excellent results as well as some new perspectives for the description of bulk properties of neutron stars when the parameter values of the model are extracted from nuclear physics. Specifically, the maximum possible mass of a neutron star before black-hole formation sets in is a few solar masses, the precise value depending on the precise values of the model parameters, and the resulting neutron star radius is of the order of 10 km.

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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