Exact results for the activity and isothermal compressibility of the hard-hexagon model
- 21 October 1988
- journal article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 21 (20) , L983-L988
- https://doi.org/10.1088/0305-4470/21/20/005
Abstract
The Klein and Fricke theory of modular functions is used to derive closed-form algebraic expressions for the activity z( rho ) and isothermal compressibility kappa T( rho ) of the hard-hexagon lattice gas model in the disordered regime, where rho is the dimensionless number density. Similar results which are valid in the ordered regime are also presented.Keywords
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