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arXiv 2512.03488math.AG
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欧几里得格式的算术不变量

Arithmetic invariants of Euclidean lattice

Shun Tang

AI总结:

本文研究了欧几里得格式的算术不变量,探讨了其在阿雷科洛夫几何中的应用,包括算术类比、有限性定理及梅林变换的积分表示。

摘要:

在本文中,我们研究了在阿雷科洛夫几何背景下欧几里得格式的算术不变量。我们将欧几里得格视为一个赫尔米特向量包$\bar E$在${\rm Spec}(\mathbb{Z})$上,并考虑了两个典型的算术类比的向量包在代数曲线上的全局截面空间的维度。一个是$$h^0_{\rm Ar}(\bar E):=\log \vert E\cap B_1 \vert$$其中$B_1$是单位球,另一个是$$h^0_θ(\bar{E}):=\log\sum_{v\in E}e^{-π\Vert v\Vert^2}$$其中$\sum_{v\in E}e^{-π\Vert v\Vert^2}$是$\bar E$的theta函数。在本文中,我们将证明以下三个陈述:(i) 无法达到绝对的黎曼-罗奇定理的事实对于$h^0_{\rm Ar}(\bar E)$来说是海森堡不确定性原理的一个实例;(ii) 正定二次型在$\mathbb{Z}$上定义的亏格中等价类的有限性等同于在${\rm Spec}(\mathbb{Z})$上赫尔米特向量包的某些等距类的有限性,并可以推导自阿雷科洛夫理论中${\rm Spec}(\mathbb{Z})$的有限性定理;(iii) 对于任何在$\mathbb{R}_{+}$上光滑且满足$f>0$且$f\circ {\rm exp}$在$\mathbb{R}$上为施瓦茨函数的函数$f$,$f$的梅林变换可以写成在${\rm Spec}(\mathbb{Z})$的阿雷科洛夫除数类群上的积分。

英文摘要:

In this paper we study the arithmetic invariants of Euclidean lattice in the context of Arakelov geometry. We regard a Euclidean lattice as a hermitian vector bundle $\bar E$ on ${\rm Spec}(\mathbb{Z})$ and consider two typical arithmetic analogues of the dimension of the space of global sections of a vector bundle on an algebraic curve. One is $$h^0_{\rm Ar}(\bar E):=\log \vert E\cap B_1 \vert$$ where $B_1$ is the unit ball, and the other is $$h^0_θ(\bar{E}):=\log\sum_{v\in E}e^{-π\Vert v\Vert^2}$$ where $\sum_{v\in E}e^{-π\Vert v\Vert^2}$ is the theta function of $\bar E$. In this paper, we shall prove the following three statements: (i) the fact that one can not reach an absolute Riemann-Roch theorem for $h^0_{\rm Ar}(\bar E)$ is an instance of the Heissenberg uncertainty principle; (ii) the finiteness of equivalence classes in the genus of a positive quadratic form defined over $\mathbb{Z}$ is equivalent to the finiteness of certain isometry classes of hermitian vector bundles on ${\rm Spec}(\mathbb{Z})$, and it can be deduced from a finiteness theorem in Arakelov theory of ${\rm Spec}(\mathbb{Z})$; (iii) for any smooth function $f$ on $\mathbb{R}_{+}$ such that $f>0$ and that $f\circ {\rm exp}$ is a Schwartz function on $\mathbb{R}$, the Mellin transform of $f$ can be written as an integral over the Arakelov divisor class group of ${\rm Spec}(\mathbb{Z})$.

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