CENTER FOR APPLIED MATHEMATICS AND THEORETICAL PHYSICS
UNIVERZA V MARIBORU UNIVERSITY OF MARIBOR
KREKOVA 2 SI-2000 MARIBOR SLOVENIA
Phone +(386) (2) 2355 350 and 2355 351 $\bullet$ Fax +(386) (2) 2355 360
Robnik@uni-mb.si $\bullet$ www.camtp.uni-mb.si
PROF.DR. MARKO ROBNIK, DIRECTOR

Seminarsko predavanje
Centra za uporabno matematiko in teoreticno fiziko

Krichever-Novikov-Algebras in Early String Theory
and Their Representations by Weierstrassian Vector Fields

Dr. Andreas Ruffing

Technische Universität München, Zentrum Mathematik
Arcisstrasse 21, D-80333 München, Germany

Abstract The propagation mechanism in an early string model on a compact Riemann surface is investigated. Starting from the time developing differential, we succesively construct algebras of meromorphic vectorfields on a punctured Riemann surface of genus 1, the theory behind being described by the Riemann-Roch theorem. A topological deformation of the surface is investigated. In total, we obtain multiparametric generalizations of the De-Witt-Algebra and its central extended version, the Virasoro algebra.

Seminarsko predavanje bo v cetrtek, 14. marca 2002 ob 15:15 uri v se- minarski sobi CAMTP, Krekova 2, pritlicje. Vljudno vabljeni vsi zainteresirani, tudi študentje.

Prof.Dr. Marko Robnik
-- Direktor CAMTP --