Riemannian submersions for q-entropies

Abstract

In an attempt to find the dynamical foundations for $q$-entropies, we examine the special case of Lagrangian/Hamiltonian systems of many degrees of freedom whose statistical behavior is conjecturally described by the $q$-entropic functionals. We follow the spirit of the canonical ensemble approach. We consider the system under study as embedded in a far larger total system. We explore some of the consequences that such an embedding has, if it is modelled by a Riemannian submersion. We point out the significance in such a description of the finite-dimensional Bakry-\'{E}mery Ricci tensor, as a local mesoscopic invariant, for understanding the collective dynamical behavior of systems described by the $q$-entropies.