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arXiv 2010.09730hep-thcond-mat.stat-mechcond-mat.str-elhep-lat
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Hamilton截断下(2+1)d $ϕ^4$ -理论的非微扰动力学

Nonperturbative dynamics of (2+1)d $ϕ^4$-theory from Hamiltonian truncation

Nikhil Anand, Emanuel Katz, Zuhair U. Khandker, Matthew T. Walters

摘要:

我们使用光锥共形截断(LCT)-一个版本的哈密顿截断-研究非微扰,实时动态的$ϕ^4$ -理论在2+1维。这个理论有紫外线的分歧,需要加以规范。我们回顾如何,在一个总能量截止的哈密顿框架,重整化必然是\emph{state-dependent},和紫外线的敏感性不能取消与标准的本地运营商counterterterms。为了克服这个问题,我们提出了一个处方,以构建适当的状态相关的计数项的(2+1)d $ϕ^4$ -理论在光锥量子化。然后,我们使用LCT与这个反项处方来研究$ϕ^4$ -理论,重点是$\mathbb{Z}_2$的保序阶段。具体来说,我们计算的光谱作为耦合的函数,并证明关闭的质量间隙(方案依赖)临界耦合。我们还计算洛伦兹不变的两点函数,无论是在一般的强耦合和临界点附近,在那里我们证明IR的普遍性和消失的应力张量的痕迹。

英文摘要:

We use Lightcone Conformal Truncation (LCT) -- a version of Hamiltonian truncation -- to study the nonperturbative, real-time dynamics of $ϕ^4$-theory in 2+1 dimensions. This theory has UV divergences that need to be regulated. We review how, in a Hamiltonian framework with a total energy cutoff, renormalization is necessarily \emph{state-dependent}, and UV sensitivity cannot be canceled with standard local operator counterterms. To overcome this problem, we present a prescription for constructing the appropriate state-dependent counterterms for (2+1)d $ϕ^4$-theory in lightcone quantization. We then use LCT with this counterterm prescription to study $ϕ^4$-theory, focusing on the $\mathbb{Z}_2$ symmetry-preserving phase. Specifically, we compute the spectrum as a function of the coupling and demonstrate the closing of the mass gap at a (scheme-dependent) critical coupling. We also compute Lorentz-invariant two-point functions, both at generic strong coupling and near the critical point, where we demonstrate IR universality and the vanishing of the trace of the stress tensor.

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