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首页> 外文期刊>Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions >Relativistic mean-field models with effective hadron masses and coupling constants, and rho(-) condensation
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Relativistic mean-field models with effective hadron masses and coupling constants, and rho(-) condensation

机译：具有有效强子质量和耦合常数以及rho（-）凝聚的相对论平均场模型

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We study relativistic mean-field models with hadron masses and coupling constants depending self-consistently on a scalar meson field. We demonstrate that by the field redefinition some models can be equivalently transformed into each other. Thereby the large variety of scaling functions for masses and couplings can be reduced to a restricted set of functions with a constrained dependence on a scalar field. We show how by choosing properly the latter scaling functions one may stiffen or soften the equation of state at high densities and simultaneously increase the threshold density for the direct Urca process without any change of the description of nuclear matter close to the saturation density. The stiffening of the equation of state might be motivated by recent neutron star mass measurements, whereas the increase of the threshold density for the direct Urca process (n(crit)(DU)) is motivated by the analysis of neutron star cooling data. The high value n(crit)(DU) also follows from the variational calculations of the A18 + delta v + UIX* Urbana-Argonne model. We demonstrate that if a rho meson is included in a mean-field model as a non-Abelian gauge boson, then there is a possibility for a charged rho-meson condensation in dense nuclear matter. We show that such a novel phase can be realized in neutron star interiors already for sufficiently low densities, typically similar to 3-4n(0), where no is the nuclear saturation density. In the framework of the relativistic mean field model the new phase arises in a second-order phase transition. The appearance of a rho(-) condensate significantly alters the proton fraction in a neutron star but changes moderately the equation of state. The neutrino emissivity of the processes involving a rho(-) meson condensate is estimated. (c) 2005 Elsevier B.V. All rights reserved.
机译：我们研究具有强子质量和耦合常数的相对论平均场模型，该模型自洽地依赖于标量介子场。我们证明，通过现场重新定义，某些模型可以等效地彼此转换。因此，可以将对质量和耦合的多种缩放函数简化为对标量场的约束依赖的一组受限函数。我们展示了如何通过适当选择后一种缩放函数，可以在高密度时增强或软化状态方程，并同时增加直接Urca过程的阈值密度，而无需改变接近饱和密度的核物质描述。状态方程的变硬可能是由最近的中子星质量测量引起的，而直接Urca过程的阈值密度（n（crit）（DU））的增加是由中子星冷却数据的分析引起的。高值n（crit）（DU）也来自A18 + delta v + UIX * Urbana-Argonne模型的变分计算。我们证明，如果将均质场模型中的rho介子作为非阿贝尔规范玻色子包含在内，那么在致密核物质中可能存在带电rho介子凝聚。我们表明，这样一种新颖的相可以在中子星内部已经实现了足够低的密度，通常类似于3-4n（0），其中没有核饱和密度。在相对论平均场模型的框架中，新阶段出现在第二阶相变中。 rh（-）冷凝物的出现显着改变了中子星中的质子分数，但适度改变了状态方程。估计了涉及rho（-）介子冷凝物的过程的中微子发射率。 （c）2005 Elsevier B.V.保留所有权利。

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