- Lev Lipatov (P)
Vladimir Andrianov (University of St Petesburg)
Alexander Andrianov (Saint Petersburg State University)
According to modern observational data the phantom equation of state for dark energy is not excluded. This scenario creates problems with stability of universe evolution. An alternative to phantom models is given by models of scalar matter with non-Hermitian, PTsymmetric interaction. In this talk we present the set of such models with several scalar fields which are exactly...
Prof. J. Luis Miramontes (Universidade de Santiago de Compostela)
I will summarize recent work aimed to show that sigma models on (semi-)symmetric spaces F/G admit discrete integrable deformations that can be viewed as deformations of the F/F gauged WZW model. For the AdS(5)xS(5) world-sheet theory, F=PSU(2,2|4) and the resulting theory has just the right amount of kappa-symmetries, which points to the existence of a new fully consistent deformed string...
Oleg Novikov (Saint-Petersburg State University, V.A.Fock Department of Theoretical Physics)
The model of scalar matter that permits the formation of a domain wall (thick brane) is studied. The potential of the scalar matter is assumed to have $O(N)$ symmetry softly broken by terms quadratic in fields. One of the fields develops delocalized kink background while others may or may not form localized configurations depending on the relative values of the parameters. We present exact...
Oriol Pujolas Boix
Recently, a new mechanism to generate a naturally small electroweak scale has been proposed. It exploits the coupling of the Higgs to an axion-like field and a long era in the early universe where the axion unchains a dynamical screening of the Higgs mass. We present a new realization of this idea with the new feature that it leaves no signs of new physics up to a rather large scale, 10^9 GeV,...