Maths HEP Lunchtime Seminars: Finite temperature dynamical correlation functions in the O(3) nonlinear sigma model
2 November 2007 13:00 in CM221
I discuss the effects of temperature on spin correlations in the spin-1 Heisenberg chain in the framework of a field theory description by means of the O(3) nonlinear sigma model. I show how to determine the dynamical structure factor at low temperature using methods of integrable quantum field theory. I discuss the relevance of the results obtained to inelastic neutron scattering experiments on Haldane-gap magnets.