Conjecture on the first Lyapunov exponent for strata with many poles

Fix a genus gg. Let QnQ_n be a sequence of connected components of strata, let pnp_n be the number of poles in the stratum containing QnQ_n, and suppose that pnp_n tends to infinity. Write λ1+(Qn)\lambda^+_1(Q_n) for the first positive Lyapunov exponent of QnQ_n. Many-poles Lyapunov-exponent conjecture. One has

λ1+(Qn)=O(1/pn).\lambda^+_1(Q_n)=\mathcal O\left(1/\sqrt{p_n}\right).

The broader Grivaux–Hubert conjecture is refuted when the number of zeros stays bounded, but numerical experiments suggest this weaker statement when the number of zeros and poles both tend to infinity. Its status is not resolved in the supplied text.

Sources & referencesView supporting material

Primary source

Charles Fougeron, “Lyapunov exponents of the Hodge bundle over strata of quadratic differentials with large number of poles”, arXiv:1611.07728 (2017).

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