Abstract
Hamiltonian SU(2) lattice gauge theory is formulated in an orthonormal and complete set of gauge-invariant eigenstates of the color-electric energy (electric-field basis). For a three-dimensional cubic lattice of linear extension L, these states are labeled by 6L3 quantum numbers: one gauge angular momentum for every link and three additional angular momenta specifying the intermediate couplings to a gauge singlet at every site. The Hamiltonian matrix elements in this basis are evaluated, and it is shown that the matrix elements of the color-magnetic energy carry an “irreducible” phase. We establish a representation of the independent-plaquette wave function in the electric-field basis as a sum over products of recoupling coefficients. Two applications to two space dimensions are given, demonstrating the feasibility of the present approach, and its extension to SU(3) is discussed.
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