中子星中的$d^*(2380)$--一种新的自由度？
The $d^*(2380)$ in neutron stars - a new degree of freedom?
摘要：
阐明中子星内部合适的微观自由度仍然是一个影响核物理、粒子物理和天体物理的悬而未决的问题。最近发现的第一个非平凡的双重子，$d^*(2380)$，提供了一个新的候选人在高物质密度的核物质状态方程的一个奇异的自由度。本文首次计算了$d^*(2380)$在中子星中的作用，基于核子自由度的相对论平均场描述，并补充了$d^*(2380)$的自由玻色子气体。计算表明，$d^*(2380)$的密度大约是正常核物质饱和密度的三倍，影响了稳定中子星的质量上限以及中子和质子的比例。还预测了由$d^*(2380)$引起的中子星冷却机制的新的可能性。
英文摘要：
Elucidating the appropriate microscopic degrees of freedom within neutron stars remains an open question which impacts nuclear physics, particle physics and astrophysics. The recent discovery of the first non-trivial dibaryon, the $d^*(2380)$, provides a new candidate for an exotic degree of freedom in the nuclear equation of state at high matter densities. In this paper a first calculation of the role of the $d^*(2380)$ in neutron stars is performed, based on a relativistic mean field description of the nucleonic degrees of freedom supplemented by a free boson gas of $d^*(2380)$. The calculations indicate that the $d^*(2380)$ would appear at densities around three times normal nuclear matter saturation density, influencing the upper mass limit for a stable neutron star and the neutron and proton fractions. New possibilities for neutron star cooling mechanisms arising from the $d^*(2380)$ are also predicted.
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