Space-time symmetric qubit regularization of the asymptotically free two-dimensional O(4) model

• Published in: arXiv.org
• Main Authors: Zhou, Junzhe, Singh, Hersh, Bhattacharya, Tanmoy, Chandrasekharan, Shailesh, Gupta, Rajan
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 27.11.2021
• Subjects: Asymptotic properties; Field theory; Hilbert space; Perturbation theory; Physics - High Energy Physics - Lattice; Physics - High Energy Physics - Theory; Physics - Nuclear Theory; Physics - Quantum Physics; Physics - Strongly Correlated Electrons; Quarks; Regularization; Relativity; Spacetime; Two dimensional models
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2111.13780

We explore if space-time symmetric lattice field theory models with a finite Hilbert space per lattice site can reproduce asymptotic freedom in the two-dimensional \(O(4)\) model. We focus on a simple class of such models with a five dimensional local Hilbert space. We demonstrate how even the simplest model reproduces asymptotic freedom within the D-theory formalism but at the cost of increasing the size of the Hilbert space through coupling several layers of a two-dimensional lattice. We then argue that qubit regularization can be viewed as an effective field theory (EFT) even if the continuum limit cannot be reached, as long as we can tune the model close enough to the continuum limit where perturbation theory, or other analytical techniques, become viable. We construct a simple lattice model on a single layer with a four dimensional local Hilbert space that acts like an excellent EFT of the original theory.