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arXiv 1302.6925nucl-thastro-ph.HEastro-ph.SR
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超核物质状态方程:超子-标量-介子耦合的影响

Equation of state of hypernuclear matter: impact of hyperon--scalar-meson couplings

Giuseppe Colucci, Armen Sedrakian

摘要:

我们在相对论性密度泛函理论下研究了超核物质的状态方程和组成。在保持核子耦合常数不变的情况下,考虑SU(6)对称性的混合和破缺,研究了超子-标量-介子耦合的参数空间。状态方程的子集对应于小的超子-标量-介子耦合值,允许大质量M < 2.25 M太阳致密星;超核星的半径在12- 14公里范围内。我们还研究了热的富中微子和无中微子的超核物质的状态方程,并证实中微子通过保持带电轻子的分数几乎不依赖于中微子透明度开始之前的密度,从而改变了状态方程并显着改变了物质的组成。本文对六个具有代表性的超核物质状态方程进行了分段多变拟合,这些拟合结果适合于数值天体物理中的应用。

英文摘要:

We study the equation of state and composition of hypernuclear matter within a relativistic density functional theory with density-dependent couplings. The parameter space of hyperon--scalar-meson couplings is explored by allowing for mixing and breaking of SU(6) symmetry, while keeping the nucleonic couplings constant fixed. The subset of equations of state, which corresponds to small values of hyperon--scalar-meson couplings allows for massive M < 2.25 M_solar compact stars; the radii of hypernuclear stars are within the range 12--14 km. We also study the equation of state of hot neutrino-rich and neutrinoless hypernuclear matter and confirm that neutrinos stiffen the equation of state and dramatically change the composition of matter by keeping the fractions of charged leptons nearly independent of the density prior to the onset of neutrino transparency. We provide piecewise polytropic fits to six representative equations of state of hypernuclear matter, which are suitable for applications in numerical astrophysics.

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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