Microcanonical Simulation of Complex Actions: The Wess Zumino Witten Case

We present the main results of our microcanonical simulation of the Wess Zumino Witten action functional. This action, being highly nontrivial and capable of exhibiting many different phase transitions, is chosen to be representative of general complex actions. We verify the applicability of microcanonical simulation by successfully obtaining two of the many critical points of the Wess ZuminoWitten action. The microcanonical algorithm has the additional advantage of exhibiting critical behaviour for a small 8 × 8 lattice. We also briefly discuss the subtleties that, in general, arise in simulating a complex action. Our algorithm for complex actions can be extended to the study of D-branes in the Wess Zumino Witten action. 1 Description and Results In Minkowski spacetime, the Feynman path integral has a complex integrand given by eM , where SM is the Minkowski action. On Euclidean continuation [email protected] [email protected]