Abstract
Abstract We consider even unimodular lattices that are critical for potential energy with respect to Gaussian potential functions in the manifold of lattices having point density $1$. All even unimodular lattices up to dimension $24$ are critical. We show how to determine the Morse index in these cases. While all these lattices are either local minima or saddle points, we find lattices in dimension $32$, which are local maxima. Also starting from dimension $32$ there are non-critical even unimodular lattices.
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