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arXiv 2501.03411nucl-th
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描述有限核与中子星物质并具有真实有效质量的新型 Skyrme 参数化。II. 调整自旋相关项

New Skyrme parametrizations to describe finite nuclei and neutron star matter with realistic effective masses. II. Adjusting the spin-dependent terms

Mingya Duan, Michael Urban

AI总结:

针对常见 Skyrme 泛函的铁磁不稳定性及 Landau 参数密度依赖问题,将 Skyrme 相互作用视为密度泛函,独立调整自旋相关项以拟合微观计算,提出 Sky3s 和 Sky4s 参数化,成功重现核物质性质并用于计算中子星物质响应与中微子散射率。

摘要:

许多常见的 Skyrme 泛函呈现铁磁不稳定性或自旋相关 Landau 参数具有不切实际的密度依赖性。为解决这些问题,我们将 Skyrme 相互作用视为密度泛函而非密度依赖的二体力。这使我们能够独立地调整我们前一篇论文 [M. Duan and M. Urban, Phys. Rev. C 110, 065806 (2024)] 中新型扩展 Skyrme 泛函的自旋相关项,而不改变自旋饱和物质的性质。自旋相关项的参数是通过将中子物质和对称核物质中的 Landau 参数 $G_0$ 和 $G'_0$,以及自旋极化物质中上下粒子的有效质量劈裂拟合到微观计算结果来确定的。使用名为 Sky3s 和 Sky4s 的新参数化,核物质的自旋相关性质与微观结果吻合良好。作为应用,我们使用具有真实有效质量和 Landau 参数的新泛函计算了中子星物质的响应函数和中微子散射率。

英文摘要:

Many common Skyrme functionals present ferromagnetic instabilities or unrealistic density dependence of the spin-dependent Landau parameters. To solve these problems, we consider the Skyrme interaction as a density-functional rather than a density-dependent two-body force. This allows us to adjust the spin-dependent terms of the new extended Skyrme functionals of our previous paper [M. Duan and M. Urban, Phys. Rev. C 110, 065806 (2024)] independently without altering the properties of spin saturated matter. The parameters of the spin-dependent terms are determined by fitting the Landau parameters $G_0$ and $G'_0$ in neutron matter and symmetric nuclear matter and the effective-mass splitting of up and down particles in spin polarized matter to the results of microscopic calculations. Using the new parametrizations, called Sky3s and Sky4s, the spin-related properties of nuclear matter are in good agreement with the microscopic results. As an application, we compute response functions and neutrino scattering rates of neutron-star matter with the new functionals having realistic effective masses and Landau parameters.

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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