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Lattice Formulas For Rational SFT Capacities

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arxiv 2106.07920 v2 pith:5ZD7HDKO submitted 2021-06-15 math.SG math.AG

classification math.SGmath.AG
keywords capacitiestoricconvexlatticersftalgebraicboundsclass
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abstract

We initiate the study of the rational SFT capacities of Siegel using tools in toric algebraic geometry. In particular, we derive new (often sharp) bounds for the RSFT capacities of a strongly convex toric domain in dimension $4$. These bounds admit descriptions in terms of both lattice optimization and (toric) algebraic geometry. Applications include (a) an extremely simple lattice formula for for many RSFT capacities of a large class of convex toric domains, (b) new computations of the Gromov width of a class of product symplectic manifolds and (c) an asymptotics law for the RSFT capacities of all strongly convex toric domains.

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