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@ -113,8 +113,8 @@ Present-day DFT calculations are almost exclusively done within the so-called Ko
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transfers the complexity of the many-body problem to the exchange-correlation (xc) functional thanks to a judicious mapping between a non-interacting reference system and its interacting analog which both have exactly the same one-electron density.
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KS-DFT \cite{Hohenberg_1964,Kohn_1965} is now the workhorse of electronic structure calculations for atoms, molecules and solids thanks to its very favorable accuracy/cost ratio. \cite{ParrBook}
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As compared to WFT, DFT has the indisputable advantage of converging much faster with respect to the size of the basis set. \cite{FraMusLupTou-JCP-15,Loos_2019d,Giner_2020}
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\titou{However, there is no systematic way of refining the approximation of the unknown exact xc functional, and therefore in practice
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one faces the unsettling choice of the \emph{approximate} xc functional. \cite{Becke_2014}}
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However, there is no systematic way of refining the approximation of the unknown exact xc functional, and therefore in practice
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one faces the unsettling choice of the \emph{approximate} xc functional. \cite{Becke_2014}
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Moreover, because of the approximate nature of the xc functional, although the resolution of the KS equations is variational, the resulting KS energy does not have such property.
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Diffusion Monte Carlo (DMC), which belongs to the family of stochastic methods, is yet another numerical scheme to obtain
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