Thermostats without conjugate points
Abstract
Abstract We generalize Hopf’s theorem to thermostats: the total thermostat curvature of a thermostat without conjugate points is non-positive and vanishes only if the thermostat curvature is identically zero. We further show that, if the thermostat curvature is zero, then the flow has no conjugate points and the Green bundles collapse almost everywhere. Given a thermostat without conjugate points, we prove that the Green bundles are transverse everywhere if and only if it is projectively Anosov. Finally, we provide an example showing that Hopf’s rigidity theorem on the $2$ -torus cannot be extended to thermostats. It is also the first example of a projectively Anosov thermostat which is not Anosov.
Fields of Study & Subjects
Advanced Theoretical and Applied Studies in Material Sciences and Geometry
Advanced Materials and Mechanics
Structural Analysis and Optimization
Publication details
- Journal / source
- Ergodic Theory and Dynamical Systems
- Volume
- 46
- Issue
- 6
- Pages
- 1494–1520
- Publication date
- 3 March 2026
- Language
- EN