Complex Langevin in Nonrelativistic Rotating Bosonic Systems
Casey Berger, University of North Carolina, Chapel Hill
Quantum field theories with a complex action suffer from a sign problem in stochastic nonperturbative treatments, making many systems of great interest – such as polarized or mass-imbalanced fermions and QCD at finite baryon density – extremely challenging to treat numerically. Another such system is that of bosons at finite angular momentum. Experimentalists have successfully achieved vortex formation in supercooled bosonic atoms and have measured quantities of interest such as the moment of inertia. However, the rotation results in a complex action, making the usual numerical treatments of the theory unusable. In this work, we use complex stochastic quantization to calculate basic properties of interacting bosons at finite angular momentum.
Abstract Author(s): Casey Berger