Abstract
The symplectic σ-model formulation of the localization problem suggests that a fixed point of Sp( n + + n −)/Sp( n − symmetry describes the localization transition. We find such a fixed point in a 4 - ϵ expansion of a Landau-Ginzburg theory of symplectic symmetry. However, it is generally unstable, indicating a breakdown of universality, the σ-model, or smoothness in critical behavior as a function of spatial dimension.
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