Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1999-01-27
Annals Phys. 275 (1999) 254-296
Physics
High Energy Physics
High Energy Physics - Theory
A misprint in the last equation corrected
Scientific paper
10.1006/aphy.1999.5934
We study the strong coupling limit of the 2-flavor massless Schwinger model on a lattice using staggered fermions and the Hamiltonian approach to lattice gauge theories. Using the correspondence between the low-lying states of the 2-flavor strongly coupled lattice Schwinger model and the antiferromagnetic Heisenberg chain established in a previous paper, we explicitly compute the mass gaps of the other excitations in terms of vacuum expectation values (v.e.v.'s) of powers of the Heisenberg Hamiltonian and spin-spin correlation functions. We find a satisfactory agreement with the results of the continuum theory already at the second order in the strong coupling expansion. We show that the pattern of symmetry breaking of the continuum theory is well reproduced by the lattice theory; we see indeed that in the lattice theory the isoscalar and isovector chiral condensates are zero to every order in the strong coupling expansion. In addition, we find that the chiral condensate $<\bar{\psi}_{L}^{(2)}\bar{\psi}_{L}^{(1)}\psi_{R}^{(1)}\psi_{R}^{(2)}>$ is non zero also on the lattice; this is the only relic in this lattice model of the axial anomaly in the continuum theory. We compute the v.e.v.'s of the spin-spin correlators of the Heisenberg model which are pertinent to the calculation of the mass spectrum and obtain an explicit construction of the lowest lying states for finite size Heisenberg Hamiltonian chains.
Berruto Federico
Grignani Gianluca
Semenoff Gordon W.
Sodano Pasquale
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