The Sign Problem, PT Symmetry and Abelian Lattice Duality

Abstract

Lattice field theories with complex actions are not easily studied using conventional analytic or simulation methods. However, a large class of these models are invariant under CT, where C is charge conjugation and T is time reversal, including models with non-zero chemical potential. For Abelian models in this class, lattice duality maps models with complex actions into dual models with real actions. For extended regions of parameter space, calculable for each model, duality resolves the sign problem for both analytic methods and computer simulations. Explicit duality relations are given for models for spin and gauge models based on Z(N) and U(1) symmetry groups. The dual forms are generalizations of the Z(N) chiral clock model and the lattice Frenkel-Kontorova model, respectively. From these equivalences, rich sets of spatially-modulated phases are found in the strong-coupling region of the original models.

6 pages, 1 figure

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Cited by in corpus (7)

• Solving the sign problems of the massless lattice Schwinger model with a dual formulation
• New developments for dual methods in lattice field theory at non-zero density
• Nonlinear sigma models at nonzero chemical potential: breaking up instantons and the phase diagram
• Simulation strategies for the massless lattice Schwinger model in the dual formulation
• The Lefschetz thimble and the sign problem
• Comparing Tensor Renormalization Group and Monte Carlo calculations for spin and gauge models
• Solving the sign problem of two flavor scalar electrodynamics at finite chemical potential