The coherent-state wave function for solid He-3

A new class of variational wave functions describing many-body systems with spin-dependent correlations is used to study solid He-3. The idea of spin coherent states is used to construct a variational coherent-state wave func tion for solid He-3 as an antisymmetrized Jastrow-Nosanow wave function tha t also contains spin-dependent correlations. We investigate this wave funct ion by a variational Monte Carlo method. The addition of triplet (three-bod y) correlations produces a ground-state energy per particle that is a consi derable improvement upon other variational results, but still appreciable d iscrepancies with the experiment remain. We speculate that such discrepanci es point to a non-negligible effect of more-than-three-body correlations fo r both liquid and solid He-3.