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Spin-wave theory and finite-size scaling for the Heisenberg antiferromagnet.

Spin-wave perturbation theory for the Heisenberg antiferromagnet at zero temperature is used to compute the finite-lattice corrections to the ground-state energy, the staggered magnetisation, and the energy gap. The dispersion relation, the spin-wave velocity, and the bulk ground-state energy to order O(1/S 2 ) are also computed for the square lattice. The results agree very well with the predictions of Neuberger and Ziman and the predictions of Fisher