Optimized random phase approximations for arbitrary reference systems: extremum conditions and thermodynamic consistence

The optimized random phase approximation (ORPA) for classical liquids is re-examined in the framework of the generating functional approach to the integral equations. We show that the two main variants of the approximation correspond to the addition of the same correction to two different first order approximations of the homogeneous liquid free energy. Furthermore, we show that it is possible to consistently use the ORPA with arbitrary reference systems described by continuous potentials and that the same approximation is equivalent to a particular extremum condition for the corresponding generating functional. Finally, it is possible to enforce the thermodynamic consistence between the thermal and the virial route to the equation of state by requiring the global extremum condition on the generating functional.Comment: 8 pages, RevTe

Numerical solution of the Optimized Random Phase Approximation

MOL. PHYS

On condensation driven by electrostatic interactions in macroionic solutions

SIGLEITItal

A theoretical study of ordering phenomena in K-In and K-Sb molten alloys

Consiglio Nazionale delle Ricerche (CNR). Biblioteca Centrale / CNR - Consiglio Nazionale delle RichercheSIGLEITItal

Freezing of liquid alkali metals as screened ionic plasmas

SIGLEITItal

Liquid-solid transition in the bond particle model for elemental semiconductors

SIGLEITItal

Optimized random phase approximation for arbitrary reference systems: extremum conditions and thermodynamic consistence

Consiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7, Rome / CNR - Consiglio Nazionale delle RichercheSIGLEITItal