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arXiv 2305.04437hep-thhep-latquant-ph
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零温两味Schwinger模型的相图

Phase Diagram of the Two-Flavor Schwinger Model at Zero Temperature

Ross Dempsey, Igor R. Klebanov, Silviu S. Pufu, Benjamin T. Søgaard, Bernardo Zan

AI总结:

本文研究了零温两味Schwinger模型在$θ$角及质量参数下的相结构,发现在$θ=π$处沿$SU(2)$不变线存在BKT型对数RG流及非微扰小质量隙,并利用哈密顿格子规范方法数值确定了对称性破缺区域边界。

摘要:

我们研究了作为$θ$角及两个质量$m_1$和$m_2$函数的两味Schwinger模型的相结构。特别地,我们在$θ=π$处发现了有趣的效应:沿着$SU(2)$不变线$m_1 = m_2 = m$,在$m$远小于电荷$g$的区域内,理论经历了Berezinskii-Kosterlitz-Thouless类型的对数RG流。因此,在该区域内存在非微扰的小质量隙$\sim e^{- A g^2/m^2}$。$SU(2)$不变线位于电荷共轭对称性自发破缺的相图区域内,我们数值确定了该区域的边界。我们的数值结果是通过包含质量平移$m_\text{lat} = m- g^2 a/4$的哈密顿格子规范表述获得的,该平移由离散手征对称性决定。

英文摘要:

We examine the phase structure of the two-flavor Schwinger model as a function of the $θ$-angle and the two masses, $m_1$ and $m_2$. In particular, we find interesting effects at $θ=π$: along the $SU(2)$-invariant line $m_1 = m_2 = m$, in the regime where $m$ is much smaller than the charge $g$, the theory undergoes logarithmic RG flow of the Berezinskii-Kosterlitz-Thouless type. As a result, in this regime there is a non-perturbatively small mass gap $\sim e^{- A g^2/m^2}$. The $SU(2)$-invariant line lies within a region of the phase diagram where the charge conjugation symmetry is spontaneously broken and whose boundaries we determine numerically. Our numerical results are obtained using the Hamiltonian lattice gauge formulation that includes the mass shift $m_\text{lat} = m- g^2 a/4$ dictated by the discrete chiral symmetry.

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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