Including an ab initio four-body potential in path integral Monte Carlo simulations of solid parahydrogen yields an equilibrium density of 0.02608 Å^-3, close to the experimental 0.0261 Å^-3, and improves pressure-density agreement up to 0.065 Å^-3.
Schnepp, ``One-phonon excited states of solid H _2 and D _2 in the ordered phase,'' Phys.\ Rev.\ A , vol
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Path-integral Monte Carlo simulations of solid parahydrogen using two-body, three-body, and four-body ab initio interaction potential energy surfaces
Including an ab initio four-body potential in path integral Monte Carlo simulations of solid parahydrogen yields an equilibrium density of 0.02608 Å^-3, close to the experimental 0.0261 Å^-3, and improves pressure-density agreement up to 0.065 Å^-3.