论文标题

内姆布鲁克表面的无限楼梯

Infinite staircases for Hirzebruch surfaces

论文作者

Bertozzi, Maria, Holm, Tara S., Maw, Emily, McDuff, Dusa, Mwakyoma, Grace T., Pires, Ana Rita, Weiler, Morgan

论文摘要

我们考虑嵌入能力函数$ c_ {h_b}(z)$,用于偏心的椭圆形的椭圆形嵌入$ z $的椭圆形嵌入到非平凡的理性Hirzebruch表面$ h_b $的家族中,并具有符号形式的符号形式,由$ b \ in [0,1,1)$。已知该功能在单调案例中具有无限的楼梯($ b = 0 $和$ b = 1/3 $)。还知道,对于每个$ b $,最多都有一个$ z $的值,这可能是这样的楼梯的积累点。在此手稿中,我们确定了三个开放式,分离,阻塞$ b $ intervals的序列,由$ b $ - 参数组成,其中$ h_b $的嵌入能力功能不包含无限楼梯。每个间隔$(0,1/5)$,$(1/5,1/3)$和$(1/3,1)$中的每个序列都有一个序列。然后,我们建立了六个相关的无限楼梯的序列,其中一个发生在被阻塞的$ b $ intervals的每个端点。楼梯数字是投影平面的斐波那契楼梯中的楼梯变体(情况$ b = 0 $)。我们还表明,即使该值没有被阻止,即使该点没有限制,也没有楼梯。本文的重点是开发图形和数字的技术,以识别潜在的楼梯,然后很好地理解障碍物,以证明所谓的楼梯确实具有所需的特性。随后的论文将更深入地探索$ B $的集合,该$ B $接收无限的楼梯。

We consider the embedding capacity functions $c_{H_b}(z)$ for symplectic embeddings of ellipsoids of eccentricity $z$ into the family of nontrivial rational Hirzebruch surfaces $H_b$ with symplectic form parametrized by $b\in [0,1)$. This function was known to have an infinite staircase in the monotone cases ($b= 0$ and $ b= 1/3$). It is also known that for each $b$ there is at most one value of $z$ that can be the accumulation point of such a staircase. In this manuscript, we identify three sequences of open, disjoint, blocked $b$-intervals, consisting of $b$-parameters where the embedding capacity function for $H_b$ does not contain an infinite staircase. There is one sequence in each of the intervals $(0,1/5)$, $(1/5,1/3)$, and $(1/3,1)$. We then establish six sequences of associated infinite staircases, one occurring at each endpoint of the blocked $b$-intervals. The staircase numerics are variants of those in the Fibonacci staircase for the projective plane (the case $b=0$). We also show that there is no staircase at the point $b=1/5$, even though this value is not blocked. The focus of this paper is to develop techniques, both graphical and numeric, that allow identification of potential staircases, and then to understand the obstructions well enough to prove that the purported staircases really do have the required properties. A subsequent paper will explore in more depth the set of $b$ that admit infinite staircases.

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