Inspired by the results of the Ising model within an imaginary external magnetic field, we introduce a transformation in quantum systems with a θ-vacuum term that amounts to a rescaling of z = cos θ/2. Making use of this transformation we are able to determine the order parameter as a function of θ. The approach is successfully tested in models with both broken and unbroken CP symmetry at θ = π.

theta-vacuum systems via real action simulations

GALANTE, ANGELO;
2003

Abstract

Inspired by the results of the Ising model within an imaginary external magnetic field, we introduce a transformation in quantum systems with a θ-vacuum term that amounts to a rescaling of z = cos θ/2. Making use of this transformation we are able to determine the order parameter as a function of θ. The approach is successfully tested in models with both broken and unbroken CP symmetry at θ = π.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11697/11184
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