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Path-integral calculations of normal liquid He-3

Authors
  • Ceperley, D.M.
Publication Date
Jul 13, 1992
Identifiers
DOI: 10.1103/PhysRevLett.69.331
OAI: oai:inspirehep.net:352212
Source
INSPIRE-HEP
License
Unknown
External links

Abstract

The first path-integral calculations of the properties of a strongly correlated continuum fermion system are described. The paths are restricted to the region of phase space with a positive trial density matrix, thereby avoiding the fermion sign problem. This restriction is exact if the nodes of the trial density matrix are correctly placed, but otherwise gives a physically reasonable approximation generalizing the ‘‘fixed-node’’ approximation used at zero temperature. Computations show that restricting the walks with the noninteracting density matrix gives good results for liquid He3 above 1 K. Using imaginary-time-independent nodes or not allowing atomic exchange results in substantially poorer agreement with experimental energies.

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