Kohn-Sham density functional theory (DFT) is a standard tool in most branches of chemistry,Ab initio methods, such as coupled-cluster, routinely produce much higher accuracy, but computational costs limit their application to small molecules to calculate coupled-cluster energies from DFT densities, reaching quantum chemical accuracy (errors below 1 kcal ⋅ mol−1) on test data. Moreover, density-based Δ-learning (learning only the correction to a standard DFT calculation, termed Δ-DFT )
I did not understand if this contains a question or simply you want to start a discussion about a comparison between DFT and coupled cluster methods.
However, let me point out that, in principle DFT is an exact theory. The accuracy is determined by the approximation in the definition of the exchange-correlation functionals. These are usually derived to achieve chemical accuracy (~45 meV) for isolated atoms (on average).
Regards.
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