Chaos, entropy and cosmology

Abstract

Customarily the dynamical behaviour of the Bianchi IX model is studied either directly, i.e. numerically, or indirectly by approximating it to a map which is conducive to analytical treatment. These studies have given rise to results that appear somewhat incongruent. The authors clarify the relationship between these two treatments by firstly clearing the status of chaos in each setting and secondly by studying the possibility of the increase in entropy in each case.