RT Journal Article
T1 Direct correlation function of the hard-sphere fluid
A1 Fernández Tejero, Carlos
A1 López de Haro, M.
AB Two analytic approximations for the direct correlation function of a hard-sphere fluid are considered. The first follows from a generalization of the Percus-Yevick result in d dimensions whereas the second arises in the Rational Function Approximation (RFA) method. Both approximations require the equation of state of the hard-sphere fluid as input. The results, derived after use of the Carnahan-Starling and the Pade [4,3] equations of state in both approaches, are compared with simulation data. The comparison shows that the first approximation is rather accurate in the region inside the core, but inherits the limitation of the Percus-Yevick theory for distances beyond the hard-sphere diameter. On the other hand, the results of the RFA method are also accurate inside the core and capture well the initial part of the tail beyond the hard-sphere diameter, but fail to account for the subsequent oscillations observed in the simulations. Other merits and limitations of the two approaches are reported.
PB Taylor & Francis Ltd
SN 0026-8976
YR 2007
FD 2007-12-10
LK https://hdl.handle.net/20.500.14352/50893
UL https://hdl.handle.net/20.500.14352/50893
DS Docta Complutense
RD 4 abr 2025