The authors show that grand-canonical fermionic expectation values can be obtained by reweighting canonical-sector data from a single bosonic-reference QMC simulation.
Exact series expansion for even frequency moments of the dynamic structure factor
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abstract
An exact series representation of the even frequency moments of the dynamic structure factor is derived. Truncations are proposed that allow to evaluate the explicitly unknown second, fourth and fifth frequency moments for the finite temperature uniform electron gas. Their applicability range in terms of degeneracy parameter and wavenumber is determined by exploiting the non-interacting limit and by comparing with the quasi-exact results of path integral Monte Carlo simulations.
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Reweighting scheme for the calculation of grand-canonical expectation values in quantum Monte Carlo simulations with a fermion sign problem
The authors show that grand-canonical fermionic expectation values can be obtained by reweighting canonical-sector data from a single bosonic-reference QMC simulation.