Continuous spin models on annealed random graphs: Modifying the modified mean-field exponents

Speaker(s): 
Christof Külske (Ruhr-Universität Bochum)
Date: 
Wednesday, May 24, 2017 - 6:15pm
Location: 
WIAS, Erhard-Schmidt-Saal, Mohrenstraße 39, 10117 Berlin

We study Gibbs distributions of continuous spins on generalized random graphs. Our main interest lies in the critical behavior of models which show a second order phase transition. We find critical exponents which differ from the mean field exponents when the weight distribution of the generalized random graph becomes too heavy-tailed. For the Ising model this has been proved to occur by Dommers, van der Hofstad, Giardina, and others very recently (CMP 2016). For continuous spins we show in the present analysis that the same modified mean-field exponents known from the Ising model, but also even new universality classes of modified exponents may appear. Joint work with Sander Dommers and Philipp Schriever