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arXiv 0808.0772nucl-thastro-ph
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多组分中微子俘获物质的低密度不稳定性

Low-Density Instability of Multi-Component Matter with Trapped Neutrinos

T. Mart, A. Sulaksono

摘要:

用不同的相对论平均场模型研究了中微子俘获对低密度下纵向介电函数的影响。本研究中使用的参数集G2的Restahl-Serot-Tang和Z271的Horowitz-Piekarewicz,以及调整后的参数集的两个模型。等矢量调整的作用和库仑相互作用的效果也进行了研究。在Horowitz-Piekarewicz模型中,不仅在无中微子的物质中,而且在有中微子俘获的物质中,等矢量调整的影响更为显著.虽然几乎与轻子分数的变化无关,但中微子俘获的物质的不稳定区域较大。与无中微子的情况相比,更多的质子和电子的存在是这一发现背后的原因。对于低密度软状态方程参数组,(q,q0 = 0)在物质不稳定区边缘的某些部分,中微子被捕获,这是由于电子和质子相互作用产生的库仑相互作用大于质子和中子之间不对称产生的排斥等矢量相互作用的结果号码

英文摘要:

The effect of neutrino trapping on the longitudinal dielectric function at low densities has been investigated by using different relativistic mean field models. Parameter sets G2 of Furnstahl-Serot-Tang and Z271 of Horowitz-Piekarewicz, along with the adjusted parameter sets of both models, have been used in this study. The role of the isovector adjustment and the effect of the Coulomb interaction have been also studied. The effect of the isovector adjustment is found to be more significant in the Horowitz-Piekarewicz model, not only in the neutrinoless matter, but also in the matter with neutrino trapping. Although almost independent to the variation of the leptonic fraction, the instability region of matter with neutrino trapping is found to be larger. The presence of more protons and electrons compared to the neutrinoless case is the reason behind this finding. For parameter sets with soft equation of states at low density, the appearance of a large and negative epsilon_L (q, q0 = 0) in some parts of the edge of the instability region in matter with neutrino trapping is understood as a consequence of the fact that the Coulomb interaction produced by electrons and protons interaction is larger than the repulsive isovector interaction created by the asymmetry between the proton and neutron numbers.

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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