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• W2069743419 abstract "We discuss the two-dimensional isotropic antiferromagnet in the framework of gauge invariance. Gauge invariance is one of the most subtle useful concepts in theoretical physics, since it allows one to describe the time evolution of complex physical system in arbitrary sequences of reference frames. All theories of the fundamental interactions rely on gauge invariance. In Dirac’s approach, the two-dimensional isotropic antiferromagnet is subject to second-class constraints, which are independent of the Hamiltonian symmetries and can be used to eliminate certain canonical variables from the theory. We have used the symplectic embedding formalism developed by a few of us to make the system under study gauge invariant. After carrying out the embedding and Dirac analysis, we systematically show how second-class constraints can generate hidden symmetries. We obtain the invariant second-order Lagrangian and the gauge-invariant model Hamiltonian. Finally, for a particular choice of factor ordering, we derive the functional Schröodinger equations for the original Hamiltonian and for the first-class Hamiltonian and show them to be identical, which justifies our choice of factor ordering." @default.
• W2069743419 created "2016-06-24" @default.
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• W2069743419 date "2013-09-18" @default.
• W2069743419 modified "2023-10-03" @default.
• W2069743419 title "Hidden Symmetries in the Two-Dimensional Isotropic Antiferromagnet" @default.
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• W2069743419 doi "https://doi.org/10.1007/s13538-013-0159-5" @default.
• W2069743419 hasPublicationYear "2013" @default.
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