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Overcrowding for zeros of Hyperbolic Gaussian analytic functions

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arxiv 2209.05854 v2 pith:6DG3JD56 submitted 2022-09-13 math.CV math.PR

classification math.CVmath.PR
keywords leftrightprobabilityzerosmathbbovercrowdinganalyticdisk
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abstract

We consider the family $\{f_L\}_{L>0}$ of Gaussian analytic functions in the unit disk, distinguished by the invariance of their zero set with respect to hyperbolic isometries. Let $n_L\left(r\right)$ be the number of zeros of $f_L$ in a disk of radius $r$. We study the asymptotic probability of the rare event where there is an overcrowding of the zeros as $r\uparrow1$, i.e. for every $L>0$, we are looking for the asymptotics of the probability $\mathbb{P}\left[n_L(r)\geq V(r)\right]$ with $V\left(r\right)$ large compared to the $\mathbb{E}\left[n_L\left(r\right)\right]$. Peres and Vir\'ag showed that for $L=1$ (and only then) the zero set forms a determinantal point process, making many explicit computations possible. Curiously, contrary to the much better understood planar model, it appears that for $L<1$ the exponential order of decay of the probability of overcrowding when $V$ is close to $\mathbb{E}\left[n_L\left(r\right)\right]$ is much less than the probability of a deficit of zeros.

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  1. Zeros of conditional Gaussian analytic functions, random sub-unitary matrices and q-series

    math.PR 2024-12 conditional novelty 8.0 of 10

    The conditional zero-count of a Gaussian power series is given by a new q-series, and the hole probability has a t-independent leading term that differs from the unconditional case.

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