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arXiv 2301.09129math.AGmath-phmath.MPnlin.SI
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三维空间中某些双有理映射的增长与可积性

Growth and integrability of some birational maps in dimension three

Michele Graffeo, Giorgio Gubbiotti

AI总结:

本文研究复射影三维空间中标准 Cremona 变换与置换其特殊点的射影变换复合所得映射,刻画其三类次数增长、周期性、可积性及不变量特征。

摘要:

受 Euler 陀螺的 Kahan–Hirota–Kimura 离散化研究的启发,本文运用代数几何技术,刻画了复射影三维空间 Cremona 群中一组元素的增长与可积性性质。该组元素由如下映射构成:将标准 Cremona 变换 $\mathrm{c}_3\in\mathrm{Bir}(\mathbb{P}^3)$ 与若干射影变换复合,这些射影变换置换 $\mathrm{c}_3$ 的不动点,以及 $\mathrm{c}_3$ 在其上执行除子收缩的点。更具体地,我们证明可能存在三种行为:(A) 可积,具有二次次数增长和两个不变量;(B) 周期,具有二周期次数序列和多于两个不变量;(C) 不可积,具有次极大次数增长和一个不变量。

英文摘要:

Motivated by the study of the Kahan--Hirota--Kimura discretisation of the Euler top, we characterise the growth and integrability properties of a collection of elements in the Cremona group of a complex projective 3-space using techniques from algebraic geometry. This collection consists of maps obtained by composing the standard Cremona transformation $\mathrm{c}_3\in\mathrm{Bir}(\mathbb{P}^3)$ with projectivities that permute the fixed points of $\mathrm{c}_3$ and the points over which $\mathrm{c}_3$ performs a divisorial contraction. More specifically, we show that three behaviour are possible: (A) integrable with quadratic degree growth and two invariants, (B) periodic with two-periodic degree sequences and more than two invariants, and (C) non-integrable with submaximal degree growth and one invariant.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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