arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1607.04205hep-th
收藏

$\mathbb{C}P^{N-1}$模型中复杂解的非微扰贡献

Non-perturbative Contributions from Complexified Solutions in $\mathbb{C}P^{N-1}$ Models

Toshiaki Fujimori, Syo Kamata, Tatsuhiro Misumi, Muneto Nitta, Norisuke Sakai

摘要:

利用高斯近似下的Lefschetz顶针形式,讨论了具有费米子自由度的$\mathbb{C}P^1$量子力学的实鞍点解和复鞍点解的非微扰贡献.我们发现bion的解决方案,这对应于(复杂化)的瞬子-反瞬子配置稳定的存在下的费米子自由度。通过计算生物子背景中的单圈行列式,我们得到了实生物子解和复生物子解的首阶贡献。为了将准零模式,成为几乎无质量的弱耦合限制,我们把bion的解决方案,以及分离的瞬子-反瞬子配置和计算的基础上Lefschetz顶针形式主义的复杂的准模积分。非微扰的贡献,从真正的和复杂的bions被示出,以抵消在超对称的情况下,并给出一个(预期)的模糊性,在非超对称的情况下,这起着至关重要的作用,在复苏的反式系列。在近似超对称情形下,Lefschetz套管的计算结果与直接计算薛定谔方程的结果完全一致.我们也进行了同样的分析sine-Gordon量子力学,并指出一些重要的差异表明,sine-Gordon量子力学不正确描述的$\mathbb{C}P^{N-1}$场论的一维极限$\mathbb{R} \times S^1$。

英文摘要:

We discuss the non-perturbative contributions from real and complex saddle point solutions in the $\mathbb{C}P^1$ quantum mechanics with fermionic degrees of freedom, using the Lefschetz thimble formalism beyond the gaussian approximation. We find bion solutions, which correspond to (complexified) instanton-antiinstanton configurations stabilized in the presence of the fermionic degrees of freedom. By computing the one-loop determinants in the bion backgrounds, we obtain the leading order contributions from both the real and complex bion solutions. To incorporate quasi zero modes which become nearly massless in a weak coupling limit, we regard the bion solutions as well-separated instanton-antiinstanton configurations and calculate a complexified quasi moduli integral based on the Lefschetz thimble formalism. The non-perturbative contributions from the real and complex bions are shown to cancel out in the supersymmetric case and give an (expected) ambiguity in the non-supersymmetric case, which plays a vital role in the resurgent trans-series. For nearly supersymmetric situation, evaluation of the Lefschetz thimble gives results in precise agreement with those of the direct evaluation of the Schrödinger equation. We also perform the same analysis for the sine-Gordon quantum mechanics and point out some important differences showing that the sine-Gordon quantum mechanics does not correctly describe the 1d limit of the $\mathbb{C}P^{N-1}$ field theory of $\mathbb{R} \times S^1$.

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。

↑