Mathematics – Dynamical Systems
Scientific paper
2004-08-31
Mathematics
Dynamical Systems
25 pages, 1 figure
Scientific paper
We study the rate of growth of ergodic sums along a sequence (a_n) of times: S_N f(x)=f(T^{a_1}x) + ... + f(T^{a_N}x). We characterize the maximal rate of growth of these ergodic sums and identify a number of sequences such as (2^n) that achieve this rate of growth. We also return to Khintchine's strong uniform distribution Conjecture which stated that the averages (1/N)(f(x)+f(2x mod 1)+...+f(Nx mod 1)) converge pointwise almost everywhere to \int f for an integrable function on [0,1). We give an elementary counterexample to this conjecture, showing that divergence occurs at the maximal rate. In addition, we consider versions of Khintchine's conjecture in which the sequence of positive integers is replaced by the increasing enumeration of a subsemigroup of the positive integers. We give necessary and sufficient conditions on the semigroup for convergence in the modified conjecture.
Quas Anthony
Wierdl Mate
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