Exploring Hamiltonian truncation in d=2+1

Exploring Hamiltonian truncation in d=2+1
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探索 d=2 1 中的哈密顿截断

DOI:
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发表时间:
2020
期刊:
影响因子:
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通讯作者:
Edward Hardy
Edward Hardy
中科院分区:
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文献类型:
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作者:
J. Miró;Edward Hardy

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我们首次将哈密顿截断方法应用于求解d=2+1$中的强耦合QFT。通过分析微扰理论与哈密顿截断调节器,我们指出了这种方法的挑战,并提出了一种方法,可以解决这些问题。这使我们能够在d=2+1$中建立φ ^4 $的哈密顿截断理论,并研究其在弱耦合和强耦合下的谱。所得结果与理论所预言的弱/强自对偶性一致。相互作用是一个强相关的紫外发散扰动,代表了一个更一般的情况下的案例研究。因此,开发的方法应该适用于许多其他感兴趣的QFT。
We initiate the application of Hamiltonian Truncation methods to solve strongly coupled QFTs in $d=2+1$. By analysing perturbation theory with a Hamiltonian Truncation regulator, we pinpoint the challenges of such an approach and propose a way that these can be addressed. This enables us to formulate Hamiltonian Truncation theory for $phi^4$ in $d=2+1$, and to study its spectrum at weak and strong coupling. The results obtained agree well with the predictions of a weak/strong self-duality possessed by the theory. The $phi^4$ interaction is a strongly relevant UV divergent perturbation, and represents a case study of a more general scenario. Thus, the approach developed should be applicable to many other QFTs of interest.