Abstract
It has been a conjecture of F.D.M.Haldane that long-wavelength excitations around antiferromagnetic vacua of certain spin chains are related to relativistic two-dimensional σ-models. We construct a class of such spin chains and associated σ-models, using symplectic geometry as a main tool. The target space of the σ-model can be an arbitrary complex flag manifold, and we find universal expressions for the metric and θ-term. The derivation relies on the fact that the flag manifold is a Lagrangian submanifold in a direct product of Grassmannians associated (via geometric quantization) to the representations of spins at consecutive sites of the spin chain. The true goal is not to reach the uttermost limits, but to discover a completeness that knows no boundaries. Rabindranath Tagore
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