Abstract
We establish exponential mixing for the geodesic flow \({\varphi_t\colon T^1S\to T^1S}\) of an incomplete, negatively curved surface S with cusp-like singularities of a prescribed order. As a consequence, we obtain that the Weil–Petersson flows for the moduli spaces \({\mathcal{M}_{1,1}}\) and \({\mathcal{M}_{0,4}}\) are exponentially mixing, in sharp contrast to the flows for \({\mathcal{M}_{g,n}}\) with \({3g-3+n > 1}\), which fail to be rapidly mixing. In the proof, we present a new method of analyzing invariant foliations for hyperbolic flows with singularities, based on changing the Riemannian metric on the phase space T 1 S and rescaling the flow \({\varphi_t}\).
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K.B. was supported by NSF Grant DMS-1001959, H.M. was supported by NSF Grant DMS 1205016, C.M. was supported by ANR Grant “GeoDyM” (ANR-11-BS01-0004), and A.W. was supported by NSF Grant DMS-1316534.
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Burns, K., Masur, H., Matheus, C. et al. Rates of mixing for the Weil–Petersson geodesic flow: exponential mixing in exceptional moduli Spaces. Geom. Funct. Anal. 27, 240–288 (2017). https://doi.org/10.1007/s00039-017-0401-3
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DOI: https://doi.org/10.1007/s00039-017-0401-3