Libxc - functionals for density-functional theory

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Density-functional theory was, without doubt, one of the greatest achievements of theoretical physics in the second half of the XXth century. It is now the workhorse theory, not only in quantum chemistry, but also in fields of atomic, molecular, and solid-state physics. At the heart of the theory, there is the famous exchange-correlation functional that has to be approximated for any practical application. For this quantity, hundreds of approximations have been proposed during the past 50 years. This project has two emphasis: the development of Libxc, a library whose purpose is to provide access to this plethora of functionals for the large community of researchers who use density functional theory; and to use the unique capabilities of Libxc to make independent benchmarks of the quality and reliability of these functionals.