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arXiv 1503.02795nucl-thastro-ph.SR
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具有Dyson-Schwinger夸克模型和各种夸克胶子顶点的混合中子星

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

H. Chen, J. -B. Wei, M. Baldo, G. F. Burgio, H. -J. Schulze

摘要:

我们用Dyson-Schwinger夸克模型和不同的夸克胶子顶点选择来研究冷密夸克物质和杂化中子星。我们得到了处于β平衡的夸克物质的状态方程,并结合Brueckner-Hartree-Fock多体理论导出的强子状态方程研究了强子-夸克的相变.与彩虹近似下夸克物质的结果相比,对于夸克-胶子顶点的Ball-Chiu近似和1BC近似导致了有限化学势下的有效相互作用的减少,定性上类似于我们的胶子传播子的作用.我们发现,夸克或混合相的相变和状态方程以及由此得到的混合星质量和半径主要取决于夸克-胶子顶点和胶子传播子效应引起的有效相互作用的整体约化,但对顶点的近似不敏感.

英文摘要:

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.

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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