Simulation strategies for the massless lattice Schwinger model in the dual formulation

Abstract

The dual form of the massless Schwinger model on the lattice overcomes the complex action problems from two sources: a topological term, as well as non-zero chemical potential, making these physically interesting cases accessible to Monte Carlo simulations. The partition function is represented as a sum over fermion loops, dimers and plaquette-surfaces such that all contributions are real and positive. However, these new variables constitute a highly constrained system and suitable update strategies have to be developed. In this exploratory study we present an approach based on locally growing plaquette-surfaces surrounded by fermion loop segments combined with a worm based strategy for updating chains of dimers, as well as winding fermion loops. The update strategy is checked with conventional simulations as well as reference data from exact summation on small volumes and we discuss some physical implications of the results.

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Cited by in corpus (10)

• Review on novel methods for lattice gauge theories
• Topological vacuum structure of the Schwinger model with matrix product states
• Abelian gauge theories on the lattice: $\theta$-terms and compact gauge theory with(out) monopoles
• Tensor lattice field theory with applications to the renormalization group and quantum computing
• Tensor renormalization group study of the non-Abelian Higgs model in two dimensions
• Tensor network formulation of the massless Schwinger model
• Massive Schwinger model at finite $\theta$
• Studying the phase diagram of the three-flavor Schwinger model in the presence of a chemical potential with measurement- and gate-based quantum computing
• New techniques and results for worldline simulations of lattice field theories
• Grassmann tensor renormalization group for the massive Schwinger model with a $\theta$ term using staggered fermions