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arXiv 0901.2622nucl-th
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强子-夸克混合相中的超子抑制

Hyperon suppression in hadron-quark mixed phase

Toshiki Maruyama, Satoshi Chiba, Hans-Josef Schulze, Toshitaka Tatsumi

摘要:

本文用Brueckner-Hartree-Fock模型和MIT袋模型研究了强子-夸克混合相的性质。为了满足吉布斯条件,电荷密度以及重子数密度在混合相中变得不均匀,伴随相分离。我们阐明了表面张力和电荷屏蔽效应的作用。我们表明,屏蔽库仑相互作用往往使混合相的几何结构不稳定,和所得的状态方程变得类似的麦克斯韦建设。然而,混合相的组成与麦克斯韦结构有很大的不同;特别是,超子在混合相中被完全抑制,因为强子相带正电。这是致密恒星中超子抑制的一种新机制。

英文摘要:

We investigate the property of the hadron-quark mixed phase using the Brueckner-Hartree-Fock model for hadron (hyperon) phase and the MIT bag model for quark phase. To satisfy the Gibbs conditions, charge density as well as baryon number density becomes non-uniform in the mixed phase, accompanying phase separation. We clarify the roles of the surface tension and the charge screening effect. We show that the screened Coulomb interaction tends to make the geometrical structure of the mixed phase less stable, and the resultant EOS becomes similar to the one given by the Maxwell construction. The composition of the mixed phase, however, is very different from that of the Maxwell construction; in particular, hyperons are completely suppressed in the mixed phase, because hadron phase is positively charged. This is a novel mechanism of hyperon suppression in compact stars.

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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