Hybrid neutron stars with the Dyson-Schwinger quark model and various quark-gluon vertices

Hybrid neutron stars with the Dyson-Schwinger quark model and various quark-gluon vertices
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具有戴森-施温格夸克模型和各种夸克-胶子顶点的混合中子星

DOI:
10.1103/physrevd.91.105002
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发表时间:
2015-03
期刊:
影响因子:
5
通讯作者:
Schulze H.-J.
Schulze H.-J.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wei Jin-Biao;Baldo M.;Burgio G. F.;Schulze H.-J.

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我们使用戴森-施温格夸克模型和夸克-胶子顶点的各种选择来研究冷稠密夸克物质和混合中子星。我们获得了β平衡状态下夸克物质的状态方程,并结合布鲁克纳-哈特里-福克多体理论中导出的强子状态方程研究了强子-夸克相变。与彩虹近似的夸克物质结果相比,夸克-胶子顶点的 Ball-Chiu ansatz 和 1BC ansatz 导致有限化学势下有效相互作用的减少,在性质上类似于我们的胶子传播器的效果。我们发现夸克或混合相的相变和状态方程以及由此产生的混合星质量和半径主要取决于由于夸克-胶子顶点和胶子传播器的影响而导致的有效相互作用的全局减少,但对顶点拟态不敏感。
We study cold dense quark matter and hybrid neutron stars with a Dyson-Schwinger quark model and various choices of the quark-gluon vertex. We obtain the equation of state of quark matter in beta equilibrium and investigate the hadron-quark phase transition in combination with a hadronic equation of state derived within the Brueckner-Hartree-Fock many-body theory. Comparing with the results for quark matter with the rainbow approximation, the Ball-Chiu ansatz and the 1BC ansatz for the quark-gluon vertex lead to a reduction of the effective interaction at finite chemical potential, qualitatively similar to the effect of our gluon propagator. We find that the phase transition and the equation of state of the quark or mixed phase and consequently the resulting hybrid star mass and radius depend mainly on a global reduction of the effective interaction due to effects of both the quark-gluon vertex and gluon propagator, but are not sensitive to the vertex ansatz.
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