The University of Queensland
 
 
Centre for Mathematical Physics
 
SEMINAR
 
 
Speaker: Prof. Giuseppe Mussardo, International School for Advanced Studies, Trieste Italy
 
 
Title: Field Theories and Statistical Models near their integrable lines
 
 
11am, Thursday 23rd February, 2006
 
 
Priestley Blding, room 641
 
Abstract:
 
Thanks to integrable quantum field theories, there has been in recent years new understanding on a large number of models of 
interest in statistical mechanics or in condensed matter physics, e.g. Ising model in a magnetic field or Sine-Gordon model. 
Integrability has permitted to determine, for instance, the exact spectrum of many systems, the explicit determination of the 
correlation functions of their order parameters, as well as their thermodynamical properties. In the seminar there will be discussed 
two methods which permits to extend this analysis also to non-integrable models: the first one is based on the Form Factor 
Perturbation Theory while the second is based on semi-classical techniques. Both approaches will be then illustrated by studying in 
details the non-integrable features of two particular significant examples: (i) the mass spectrum of the Ising model by varying the 
temperature and the magnetic field, (ii) the Double Sine-Gordon model.
 
 
All interested are invited to attend. There will be a group lunch at the staff club following the seminar. 
 
 
Enquiries to Katrina Hibberd email: keh@maths.uq.edu.au