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A new variational wave function is proposed for the ground state of Bose liquids. It consists of a Jastrow function multiplied by exponentials of three-particle functions. The form of the wave function is deduced from a formal analysis carried out for the weakly interacting Bose gas characterized by a strength parameter λ. By using the wave function proposed here, the energy obtained is exact to O(λ⁴). Several useful and straightforward applications of the new method to liquid helium and Coulomb gases are suggested.
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Chia-Wei Woo (1972) studied this question.
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