GLOBAL DEMONS IN-FIELD THEORY - CRITICAL SLOWING-DOWN IN THE XY MODEL

We investigate the use of global demons, a ''canonical dynamics'', as an approach to simulating lattice regularized field theories. This det erministically chaotic dynamics is non-local and non-hamiltonian, and preserves the canonical measure rather than delta(H - E). We apply thi s inexact dynamics to the 2D XY model, comparing to various implementa tions of hybrid Monte Carlo, focusing on critical exponents and critic al slowing down. In addition, we discuss a scheme for making energy no n-conserving dynamical algorithms exact without the use of a Metropoli s hit.