arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0904.0413hep-phhep-thnucl-th
收藏

极端条件下QCD的自发P-破坏

Spontaneous P-violation in QCD in extreme conditions

A. A. Andrianov, V. A. Andrianov, D. Espriu

摘要:

本文研究了在有限重子密度和温度下,量子色动力学中宇称自发破缺的可能性。分析是对理想均匀无限大核物质进行的,其中密度的影响可以借助于恒定的化学势来考察。QCD近似于一个广义的sigma模型,其中包含标量和伪标量的两个等重态。与化学势的相互作用是通过耦合到组分夸克场作为核子不被认为是点状的自由度,在我们的方法。这种宇称破坏的机制是基于最轻和最重自由度之间的相互作用,并且在仅保留π介子和核子扇区的简单模型中无法理解。我们认为,在适当的环境中(密度正常、温度适中的高密度热核物质),宇称破缺可能是普遍现象而不是例外,它的发生与正常核物质稳定束缚态的存在是完全相容的。我们证明了在支持自发宇称破缺的参数区域中,不会发生所谓的“手征坍缩”。

英文摘要:

We investigate the possibility of parity being spontaneously violated in QCD at finite baryon density and temperature. The analysis is done for an idealized homogeneous and infinite nuclear matter where the influence of density can be examined with the help of constant chemical potential. QCD is approximated by a generalized sigma-model with two isomultiplets of scalars and pseudoscalars. The interaction with the chemical potential is introduced via the coupling to constituent quark fields as nucleons are not considered as point-like degrees of freedom in our approach. This mechanism of parity violation is based on interplay between lightest and heavier degrees of freedom and it cannot be understood in simple models retaining the pion and nucleon sectors solely. We argue that, in the appropriate environment (dense and hot nuclear matter of a few normal densities and moderate temperatures), parity violation may be the rule rather than the exception and its occurrence is well compatible with the existence of stable bound state of normal nuclear matter. We prove that the so called 'chiral collapse' never takes place for the parameter region supporting spontaneous parity violation.

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。

↑