Data:	Venerdì 2 Marzo 2007, ore 16.00
Luogo:	Aula 1201, Dip. Matematica, U. Roma "Tor Vergata"
Speaker:	Prof. Christian Jaekel, Universidad de Talca, Chile
Titolo:	THE P(Φ)2 MODEL ON THE DE SITTER SPACE
Abstract:	This is joint work with J. Barata and J. Mund. We provide a self-contained construction of the model, based on a great variety of methods and results from the literature, including harmonic analysis on symmetric spaces, group representation theory, Markov processes, Tomita-Takesaki modular theory and Osterwalder-Schrader reconstruction theorems. The thermal aspects (Hawking temperature) induced by the curvature and the the exceptional case of particles with small masses are discussed in the interacting case. We also explore the relations of the euclidean approach to the Wightman and Haag-Kastler axiomatic schemes which have been proposed for de Sitter space recently.