We show that positive Lyapunov exponents imply upper quantum dynamical bounds for Schrödinger
operators
,
where
is a piecewise Hölder function on a compact Riemannian manifold
, and
is a
uniquely ergodic volume-preserving map with zero topological entropy. As corollaries
we also obtain localization-type statements for shifts and skew-shifts on
higher-dimensional tori with arithmetic conditions on the parameters. These are the
first localization-type results with precise arithmetic conditions for multifrequency
quasiperiodic and skew-shift potentials.
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