Mathematics – Number Theory
Scientific paper
2011-10-10
Mathematics
Number Theory
23 pages, Theorem 2.1 3) in the previous versions is wrong and deleted. No essential change on the constructed sphere packings
Scientific paper
1) We present new lattice sphere packings in Euclid spaces of many dimensions in the range 3332-4096, which are denser than known densest Mrodell-Weil lattice sphere packings in these dimensions. Moreover it is proved that if there were some nice linear binary codes we could construct lattices denser than Mordell-Weil lattices of many dimensions in the range 116-3332. 2) New lattices with densities at least 8 times of the densities of Craig lattices in the dimensions $p-1$, where $p$ is a prime satisfying $p-1 \geq 1222$, are constructed. Some of these lattices provide new record sphere packings. 3) Lattice sphere packings in many dimensions in the range 4098-8232 better than present records are presented. Some new dense lattice sphere packings in moderate dimensions $84, 85, 86, 181-189$ denser than any previously known sphere packings in these dimensions are also given. The construction is based on the analogues of Craig lattices.
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