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Abstract
In this work we investigate how the description of several properties of helium atoms in thecondensed phases are affected by the three-body terms of a very accurate inter-atomicpotential. We introduce two phenomenological parameters in the three-body part of theinter-atomic potential in order to describe properly the equations of state of the solid andliquid phases. The calculations were performed using the multi-weight extension to thediffusion Monte Carlo method which allows accurate calculations of small energy differencesin a significant way. The results show how the equations of state for both theliquid and solid phases and properties like the isothermal compressibility, theequilibrium, melting and freezing densities are affected by three-body interactions.
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