The screened cluster equation of state for hydrogen-helium mixtures: Atomic, molecular, and ionic contributions from first principles

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Quantum screened interactions in moderately dense plasmas and atomic contributions to thermodynamics

Comment on "Direct linear term in the equation of state of plasmas"

In a recent paper [Phys. Rev. E 91, 013108 (2015)], Kraeft et al. criticize known exact results on the equation of state of quantum plasmas, which have been obtained independently by several authors. They argue about a difference in the definition of the direct two-body function Q(x), which appears in virial expansions of thermodynamical quantities, but Q(x) is not a measurable quantity in itself. Differences in definitions of intermediate quantities are irrelevant, and only differences in physical quantities are meaningful. Beyond Kraeft et al.'s broad statement that there is no agreement at order ρ(5/2) in the virial equation for the pressure, we show that their published results for this…