Introduction to the Variational Density Matrix
Method and its Application to Dense Hydrogen
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Introduction to the Variational Density Matrix
Method and its Application to Dense Hydrogen

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Burkhard Militzer and E. L. Pollock

A new variational principle for optimizing thermal density matrices is
introduced. As a first application, the variational many body density matrix
is written as a determinant of one body density matrices which
are approximated by Gaussians with the mean, width and amplitude as
variational parameters. This variational density matrix is used to calculate properties
of the hot, dense hydrogen. First results for a density of r_{s}=2 are
presented.