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arXiv 1806.10481math.AGmath.PR
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实Riemann surfaces上线丛的随机截面

Random sections of line bundles over real Riemann surfaces

Michele Ancona

摘要:

设$\mathcal{L}$是定义在$\mathbb{R}$上的黎曼曲面$Σ$上的正线丛。证明了$\mathcal{L}^d$的$s$、$d\gg 0$的实零点个数$\#Z_s$偏离期望值的部分是罕见的.我们还提供了渐近的形式$\mathbb{E}[(\#Z_s-\mathbb{E}[\# Z_s])^k]=O(\sqrt{d}^{k-1-α})$和${\mathbb{E}[\#Z^k_s]=a_k\sqrt{d}^{k}+b_k\sqrt{d}^{k-1}+O(\sqrt{d}^{k-1-α})}$的所有(中心)时刻的实零点的数量。这里,$α$是$(0,1)$中的任意数,$a_k$和$b_k$是一些显式的正常数.最后,我们得到了随机截面复零点分布的类似渐近性质.我们的证明涉及Bergman核估计以及Olver多空间。

英文摘要:

Let $\mathcal{L}$ be a positive line bundle over a Riemann surface $Σ$ defined over $\mathbb{R}$. We prove that sections $s$ of $\mathcal{L}^d$, $d\gg 0$, whose number of real zeros $\#Z_s$ deviates from the expected one are rare. We also provide asymptotics of the form $\mathbb{E}[(\#Z_s-\mathbb{E}[\# Z_s])^k]=O(\sqrt{d}^{k-1-α})$ and ${\mathbb{E}[\#Z^k_s]=a_k\sqrt{d}^{k}+b_k\sqrt{d}^{k-1}+O(\sqrt{d}^{k-1-α})}$ for all the (central) moments of the number of real zeros. Here, $α$ is any number in $(0,1)$, and $a_k$ and $b_k$ are some explicit and positive constants.Finally, we obtain similar asymptotics for the distribution of complex zeros of random sections. Our proof involves Bergman kernel estimates as well as Olver multispaces.

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