# American Institute of Mathematical Sciences

July  2000, 6(3): 645-650. doi: 10.3934/dcds.2000.6.645

## On rigidity properties of contact time changes of locally symmetric geodesic flows

 1 Department of Mathematics and Statistics, McMaster University, Hamilton, Canada, L8S 4K1, Canada

Received  January 1999 Revised  September 1999 Published  April 2000

In analogy with the geometric $1/4$-pinching and entropy rigidiity of compact negatively curved locally symmetric spaces, we study in this note the dynamical rigidity of contact time changes of the geodesic flow for these spaces.
Citation: Jeffrey Boland. On rigidity properties of contact time changes of locally symmetric geodesic flows. Discrete and Continuous Dynamical Systems, 2000, 6 (3) : 645-650. doi: 10.3934/dcds.2000.6.645
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