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The Lerch zeta function I. Zeta integrals

  • Jeffrey C. Lagarias EMAIL logo and Wen-Ching Winnie Li
Published/Copyright: January 19, 2012

Abstract.

This is the first of four papers that study algebraic and analytic structures associated to the Lerch zeta function. This paper studies “zeta integrals” associated to the Lerch zeta function using test functions, and obtains functional equations for them. Special cases include a pair of symmetrized four-term functional equations for combinations of Lerch zeta functions, found by A. Weil, for real parameters (a,c) with 0<a,c<1. It extends these functions to real a and c, and studies limiting cases of these functions where at least one of a and c take the values 0 or 1. A main feature is that as a function of three variables (s,a,c), in which a and c are real, the Lerch zeta function has discontinuities at integer values of a and c. For fixed s, the function (s,a,c) is discontinuous on part of the boundary of the closed unit square in the (a,c)-variables, and the location and nature of these discontinuities depend on the real part (s) of s. Analysis of this behavior is used to determine membership of these functions in Lp([0,1]2,dadc) for 1p<, as a function of (s). The paper also defines generalized Lerch zeta functions associated to the oscillator representation, and gives analogous four-term functional equations for them.

Received: 2008-10-05
Revised: 2010-02-07
Published Online: 2012-01-19
Published in Print: 2012-January

© 2012 by Walter de Gruyter Berlin Boston

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