  Ground state properties of condensed Helium are calculated using the Path
Integral Ground State (PIGS) method. A fourth-order approximation is used as
short (imaginary) time propagator. We compare our results with those obtained
with other Quantum Monte Carlo techniques and different propagators. For this
particular application, we find that the fourth-order propagator performs
comparably to the pair product approximation, and is far superior to the
primitive approximation. Results obtained for the equation of state of
condensed Helium show that PIGS compares favorably to other QMC methods
traditionally utilized for this type of calculation.
