Lattice ϕ4 field theory on Riemann manifolds: Numerical tests for the 2D Ising CFT on S2

We present a method for defining a lattice realization of the ϕ4 quantum field theory on a simplicial complex in order to enable numerical computation on a general Riemann manifold. The procedure begins with adopting methods from traditional Regge calculus (RC) and finite element methods (FEM) plus...

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Bibliographic Details
Published in:Physical review. D 2018-07, Vol.98 (1), p.014502
Main Authors: Brower, Richard C, Cheng, Michael, Weinberg, Evan S, Fleming, George T, Gasbarro, Andrew D, Raben, Timothy G, Tan, Chung-I
Format: Article
Language:English
Subjects:
Anthologies
Field theory
Finite element method
Ising model
Numerical analysis
Quantum field theory
Quantum theory
Riemann manifold
Online Access:Get full text
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Summary:We present a method for defining a lattice realization of the ϕ4 quantum field theory on a simplicial complex in order to enable numerical computation on a general Riemann manifold. The procedure begins with adopting methods from traditional Regge calculus (RC) and finite element methods (FEM) plus the addition of ultraviolet counterterms required to reach the renormalized field theory in the continuum limit. The construction is tested numerically for the two-dimensional ϕ4 scalar field theory on the Riemann two-sphere, S2, in comparison with the exact solutions to the two-dimensional Ising conformal field theory (CFT). Numerical results for the Binder cumulants (up to 12th order) and the two- and four-point correlation functions are in agreement with the exact c=1/2 CFT solutions.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.98.014502