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arXiv 1811.00528hep-thhep-lat
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$S^d$上的RG流和Hamilton截断

RG flows on $S^d$ and Hamiltonian truncation

Matthijs Hogervorst

摘要:

我们描述了一种非微扰方法来计算$d$ -维球$S^d$上标量QFT集的配分函数和相关函数。该方法依赖于一个哈密顿图片,其中的理论是量化的$S^{d-1}$和状态演变的时间依赖于时间的哈密顿。最重要的是,$S^{d-1}$上的希尔伯特空间被截断为低于截止值的有限状态集。在整个工作中,我们专注于$ϕ^2$和$iϕ^3$流在三个维度。在本文的第一部分中,我们分析了各种观测量的截止依赖性,计算了要添加到作用量中的发散项和RG改进项。接下来,我们提出了非微扰的结果$S^3$上的大规模标量,找到良好的协议之间的强耦合制度的数值数据和$F$系数的自由标量CFT。我们还检查了重正化$i ϕ^3$理论对$S^3$是非微扰UV有限的。该方案的问题打破了$\mathrm{SO}(d+1)$时空对称群的$S^d$下降到$\mathrm{SO}(d)$,并在一个例子中,我们研究如何恢复完整的对称性在连续极限。我们的方法与Al.B.还解释了涉及$S^2$上的特定RG流的Zamolodchikov。

英文摘要:

We describe a nonperturbative method to compute the partition function and correlation functions for scalar QFTs set on the $d$-dimensional sphere $S^d$. The method relies on a Hamiltonian picture, where the theory is quantized on $S^{d-1}$ and states evolve in time by means of a time-dependent Hamiltonian. Crucially, the Hilbert space on $S^{d-1}$ is truncated to a finite set of states below a cutoff. Throughout this work we focus on the $ϕ^2$ and $iϕ^3$ flows in three dimensions. In the first part of this paper we analyze the cutoff-dependence of various observables, computing both divergent and RG-improvement counterterms to be added to the action. Next we present nonperturbative results for the massive scalar on $S^3$, finding good agreement in the strong-coupling regime between numerical data and the $F$-coefficient of the free scalar CFT. We also check that the renormalized $i ϕ^3$ theory on $S^3$ is nonperturbatively UV-finite. The scheme in question breaks the $\mathrm{SO}(d+1)$ spacetime symmetry group of $S^d$ down to $\mathrm{SO}(d)$, and in an example we study how the full symmetry is restored in the continuum limit. The relation between our method and earlier work by Al. B. Zamolodchikov involving a specific RG flow on $S^2$ is explained as well.

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