RIESZ BASES, MEYER'S QUASICRYSTALS, AND BOUNDED REMAINDER SETS

We consider systems of exponentials with frequencies belonging to simple quasicrystals in R-d. We ask if there exist domains S in R-d which admit such a system as a Riesz basis for the space L-2(S). We prove that the answer depends on an arithmetical condition on the quasicrystal. The proof is based on the connection of the problem to the discrepancy of multi-dimensional irrational rotations, and specifically, to the theory of bounded remainder sets. In particular it is shown that any bounded remainder set admits a Riesz basis of exponentials. This extends to several dimensions (and to the non-periodic setting) the results obtained earlier in dimension one.