Smooth Sums over Smooth $k$-Free Numbers and Statistical Mechanics

We provide an asymptotic estimate for certain sums over k-free integers with small prime factors. These sums depend upon a complex parameter αand involve a smooth cut-off f. They are a variation of several classical number-theoretical sums. One term in the asymptotics is an integral operator whose kernel is the α-convolution of the Dickman-de Bruijn distribution, and the other term is explicitly estimated. The trade-off between the value of αand the regularity of f is discussed. This work generalizes the results of tow previous papers by the author and Ya.G. Sinai, where k=2 and α=1.

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