6,394 research outputs found
Variational Methods for Nuclear Systems with Dynamical Mesons
We derive a model Hamiltonian whose ground state expectation value of any
two-body operator coincides with that obtained with the Jastrow correlated wave
function of the many-body Fermi system. Using this Hamiltonian we show that the
variational principle can be extended to treat systems with dynamical mesons,
even if in this case the concept of wave function looses its meaning
Hellmann and Feynman theorem versus diffusion Monte Carlo experiment
In a computer experiment the choice of suitable estimators to measure a
physical quantity plays an important role. We propose a new direct route to
determine estimators for observables which do not commute with the Hamiltonian.
Our new route makes use of the Hellmann and Feynman theorem and in a diffusion
Monte Carlo simulation it introduces a new bias to the measure due to the
choice of the auxiliary function. This bias is independent from the usual one
due to the choice of the trial wave function. We used our route to measure the
radial distribution function of a spin one half Fermion fluid.Comment: 7 pages, 1 figure, 1 tabl
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