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arXiv 0810.5527math.COmath.DS
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基于对应原理的有限域上Gowers范数的逆猜想

The inverse conjecture for the Gowers norm over finite fields via the correspondence principle

Terence Tao, Tamar Ziegler

摘要:

关于有限域$\F$上的有限维向量空间$V$的Gowers范数$U^d(V)$的逆猜想断言,粗略地说,有界函数$f$具有大的Gowers范数$\|f\|_{U^d(V)}$当且仅当它与次数至多为$d-1$的相位多项式$ϕ= e_\F(P)$相关,因此$P: V \to \F$是次数至多为$d-1$的多项式。在本文中,我们开发了一个变种的Furstenberg对应原理,使我们能够建立这个猜想在大的特征情况下$\charac(F) \geq d$从遍历理论对应,这是最近建立的Bergelson和作者。在低特征下,我们得到了一个部分结果,其中相位多项式$ϕ$允许有较大的次数$C(d)$。完整的逆猜想在低特征中仍然是开放的;在这种情况下,Lovett-Meshulam-Samorodnitsky或Green-Tao的反例可以通过稍微重新表述猜想来避免。

英文摘要:

The inverse conjecture for the Gowers norms $U^d(V)$ for finite-dimensional vector spaces $V$ over a finite field $\F$ asserts, roughly speaking, that a bounded function $f$ has large Gowers norm $\|f\|_{U^d(V)}$ if and only if it correlates with a phase polynomial $ϕ= e_\F(P)$ of degree at most $d-1$, thus $P: V \to \F$ is a polynomial of degree at most $d-1$. In this paper, we develop a variant of the Furstenberg correspondence principle which allows us to establish this conjecture in the large characteristic case $\charac(F) \geq d$ from an ergodic theory counterpart, which was recently established by Bergelson and the authors. In low characteristic we obtain a partial result, in which the phase polynomial $ϕ$ is allowed to be of some larger degree $C(d)$. The full inverse conjecture remains open in low characteristic; the counterexamples by Lovett-Meshulam-Samorodnitsky or Green-Tao in this setting can be avoided by a slight reformulation of the conjecture.

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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