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By L.F. McAuley

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17 K. 13 The results obtained by McMillan were later on corroborated by Schiff and Verlet, 14 and Murphy and Watts. 2) is manifestly not the optimal one. This can be obtained by solving the optimal Euler-Lagrange equation 16 ^ > = 0 Sf(r) (13) °- (L3) Eq. 2) does not contain, for example, the right behavior 1/r 2 when r —>• oo which is necessary to reproduce the linear behavior of the static structure factor S(k) when k —> 0. 2 K is obtained). 17 A more significant effect in the binding energy is achieved by introducing three-body correlations in the trial wave function V' = n h (rij) i<3 J J h (nj, rik, rjk) .

BoronatQupc. es Quantum Monte Carlo methods which work a,t zero temperature are reviewed and discussed. These methods are nowadays standard tools in condensed matter physics, a field where they have proven their reliability and accuracy. The present review is mainly concerned with recent results obtained by using quantum Monte Carlo for studying the energetics and structural properties of homogeneous liquid helium in different geometries. 1. Monte Carlo methods and condensed helium The history of quantum Monte Carlo methods is closely related to the physics of the condensed phases of helium.

The first one is to ask for a possible better optimization of the variational parameters entering in the initial guess. If this first possibility is exhaustively explored and no success is attained, then it becomes necessary to improve the model nodal surface. At this point, the analytical improvement of ip, following the method presented in the preceding subsection, is able to generate a new ip to be explored again, using first FN and then RN to stress its quality. 4. Preliminary considerations for a D M C calculation of liquid 4 H e The DMC method has been widely applied to the microscopic study of superfmid 4 He.

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