Generic semisimplicity conjecture for time changes of transitive Anosov flows

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Let XX be a transitive Anosov vector field on a closed 3-manifold M\mathcal{M}. Let Ω01\Omega_0^1 denote the space of closed resonant 11-forms at zero, and let LfX\mathcal{L}_{fX} be the Lie derivative along the time-changed vector field fXfX. Generic semisimplicity conjecture. There exists an open and dense set O⊂C∞(M;R>0)\mathcal O\subset C^{\infty}(\mathcal{M}; \mathbb{R}_{>0}) such that for f∈Of\in \mathcal O, the action of L⁡fX\operatorname{\mathcal{L}}_{fX} on Ω01\Omega_0^1 is semisimple. The conjecture concerns the remaining obstruction to computing the order of vanishing at zero of the Ruelle zeta function from geometric multiplicities. Semisimplicity can depend on the parametrisation: some time changes of geodesic flows of hyperbolic surfaces are known not to be semisimple, while the generic assertion remains open.

References

Primary source

Mihajlo Cekić and Gabriel P. Paternain, “Resonant forms at zero for dissipative Anosov flows”, arXiv:2211.06255 (2025).

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