The self-dual relaxed lattice equality conjecture

A relaxed lattice is a tempered distribution gg such that gg and its Fourier transform g^\widehat{g} have the form

i0aiδri\sum_{i \ge 0} a_i \delta_{r_i}

where ai0a_i \ge 0 for all ii (not all zero) and 0=r0<r1<r2<0=r_0<r_1<r_2<\cdots. It is self-dual when g^=g\widehat{g}=g.

Self-dual relaxed lattice conjecture. In every dimension, the largest possible value of r1r_1 among self-dual relaxed lattices equals the smallest value of rr possible in Theorem 3.2 of Cohn and Elkies.

This conjecture identifies the optimum of the rescaled self-dual relaxed-lattice problem with the optimum in the earlier dual-program bound for sphere packing. The supplied text does not state whether this equality has been proved or disproved.

Sources & referencesView supporting material

Primary source

Henry Cohn, “New upper bounds on sphere packings II”, arXiv:math/0110010 (2002).

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