| E 2.304
Vortrag: The special value Z'(1) of the Selberg zeta function
Abstract: In this talk, we report on an explicit formula for the special value at s=1 of the derivative of the Selberg zeta function for the modular group Gamma=PSL_2 (Z). The formula is a consequence of a generalization of the arithmetic Riemann--Roch theorem of Deligne and Gillet-Soule to the case of the trivial sheaf on Gamma\H, equipped with the hyperbolic metric. The proof uses methods of zeta regularisation and relies on Mayer-Vietoris type formulas for determinants of Laplacian. This is joint work with Gerard Freixas.