Exchange-diffusion Monte Carlo – Michael Hutcheon

October 23, 2019 @ 11:30 am – 12:30 pm
Mott Seminar Room
Cavendish Laboratory

Diffusion quantum Monte Carlo is a formally exact way to treat many-body quantum systems. Unfortunately, for electronic systems it suffers from the so-called fermion sign problem. In this talk I will demonstrate how the sign problem arises in a formally exact implementation of fermionic diffusion Monte Carlo. I will go on to demonstrate how this exercise informs the construction of alternative approximate (but asymptotically exact) methods to the popular fixed-node approximation.