We explore whether a root lattice may be similar to the lattice of integers of a number field K endowed with the inner product (x,y):= TraceK/Q(x.(y)), where is an involution of K. We classify all pairs K, such that is similar to either an even root lattice or the root lattice Z[K:Q]. We also classify all pairs K, θ such that is a root lattice. In addition to this, we show that is never similar to a positive-definite even unimodular lattice of rank ≤ 48, in particular, is not similar to the Leech lattice. In Appendix B, we give a general cyclicity criterion for the primary components of the discriminant group of.
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