Several devastating conflicts have persisted in Sub-Saharan Africa for the past 20 years or more. Some countries are still emerging from the era of cold war politics, while debilitating internal struggles continue to plague others. Ethiopia, Namibia, South Africa, Uganda, and more recently,...

A large deviation technique is used to calculate the microcanonical entropy function s(v,m) of the mean-field ϕ<Superscript>4</Superscript>-model as a function of the potential energy v and the magnetization m. As in the canonical ensemble, a continuous phase transition is found. An analytical expression is obtained for...</superscript>