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On the functional properties of Bessel zeta-functions

Takumi Noda (2015)

Acta Arithmetica

Zeta-functions associated with modified Bessel functions are introduced as ordinary Dirichlet series whose coefficients are J-Bessel and K-Bessel functions. Integral representations, transformation formulas, a power series expansion involving the Riemann zeta-function and a recurrence formula are given. The inverse Laplace transform of Weber's first exponential integral is the basic tool to derive the integral representations. As an application, we give a new proof of the Fourier series expansion...

On the mean square of the divisor function in short intervals

Aleksandar Ivić (2009)

Journal de Théorie des Nombres de Bordeaux

We provide upper bounds for the mean square integral X 2 X 𝔻 k ( x + h ) - 𝔻 k ( x ) 2 d x , where h = h ( X ) 1 , h = o ( x ) as X and h lies in a suitable range. For k 2 a fixed integer, 𝔻 k ( x ) is the error term in the asymptotic formula for the summatory function of the divisor function d k ( n ) , generated by ζ k ( s ) .

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