Mathematics – Differential Geometry
Scientific paper
2011-09-24
Mathematics
Differential Geometry
The results of this paper were announced in a talk last year in IMPA, Rio (Poisson 2010)
Scientific paper
We give a notion of entropy for general gemetric structures, which generalizes well-known notions of topological entropy of vector fields and geometric entropy of foliations, and which can also be applied to singular objects, e.g. singular foliations, singular distributions, and Poisson structures. We show some basic properties for this entropy, including the \emph{additivity property}, analogous to the additivity of Clausius--Boltzmann entropy in physics. In the case of Poisson structures, entropy is a new invariant of dynamical nature, which is related to the transverse structure of the characteristic foliation by symplectic leaves.
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