Mathematics – Metric Geometry
Scientific paper
2008-08-14
Advances in Mathematics 225 (2010), 2546-2564
Mathematics
Metric Geometry
20 pages, 1 table; some corrections, incorporated referee suggestions
Scientific paper
10.1016/j.aim.2010.05.002
We introduce a parameter space for periodic point sets, given as unions of $m$ translates of point lattices. In it we investigate the behavior of the sphere packing density function and derive sufficient conditions for local optimality. Using these criteria we prove that perfect, strongly eutactic lattices cannot be locally improved to yield a periodic sphere packing with greater density. This applies in particular to the densest known lattice sphere packings in dimension $d\leq 8$ and $d=24$.
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