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arXiv 0901.4942hep-th
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相交膜与Nambu $-$ Jona-Lasinio模型

Intersecting branes and Nambu$-$Jona-Lasinio model

Avinash Dhar, Partha Nag

摘要:

本文讨论了Sakai和Sugimoto交叉膜模型在弱耦合下的手征对称性破缺,并给出了味$D8$和反$D8$ -膜之间的一般分离值$L$.对于颜色$D4$ -膜围绕的圆的半径$R$的任何有限值,非定域Nambu $-$ Jona-Lasinio(NJL)型短程相互作用耦合味膜和反膜。我们认为,手征对称性是打破在这个模型中,只有在一定的临界值以上的4维的t Hooft耦合,并确认这通过数值计算的间隙方程的解决方案。我们还数值研究了手征对称性破缺的限制$R \to \infty$保持$L$固定,但发现,简单的方法来实现这一限制不导致一致的图片手征对称性打破非紧凑版本的非本地NJL模型。

英文摘要:

We discuss chiral symmetry breaking in the intersecting brane model of Sakai and Sugimoto at weak coupling for a generic value of separation $L$ between the flavour $D8$ and anti-$D8$-branes. For any finite value of the radius $R$ of the circle around which the colour $D4$-branes wrap, a non-local Nambu$-$Jona-Lasinio (NJL) type short-range interaction couples the flavour branes and anti-branes. We argue that chiral symmetry is broken in this model only above a certain critical value of the 4-dimensional 't Hooft coupling and confirm this through numerical calculations of solutions to the gap equation. We also numerically investigate chiral symmetry breaking in the limit $R \to \infty$ keeping $L$ fixed, but find that simple ways of implementing this limit do not lead to a consistent picture of chiral symmetry breaking in the non-compact version of the non-local NJL model.

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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