Data:	Mercoledì 3 Marzo 2004, Ore 16.30
Luogo:	Aula 1201, Dip. Matematica, U. Roma "Tor Vergata"
Speaker:	Dott. Fabio Ciolli, Roma
Titolo:	ON SUPERSELECTION SECTORS OF MASSLESS SCALAR FREE FIELD IN 1+1 DIMENSIONS
Abstract:	Superselection structure of massless scalar Free Field observables net in 1+1 dimensions (Streater and Wilde model) is discussed, showing the existance of a global compact group of gauge simmetries and a non trivial relative commutant in the fields net. Relevant used tools are twisted crossed products of Weyl algebras, non regular representations and Roberts local cohomology. Relations with other works on non-rational models, soliton sectors and non trivial center situations is also illustrated.