Mathematics > Symplectic Geometry
[Submitted on 10 Apr 2009 (v1), last revised 24 Jul 2011 (this version, v4)]
Title:Displacing Lagrangian toric fibers via probes
View PDFAbstract:This note studies the geometric structure of monotone moment polytopes (the duals of smooth Fano polytopes) using probes. The latter are line segments that enter the polytope at an interior point of a facet and whose direction is integrally transverse to this facet. A point inside the polytope is displaceable by a probe if it lies less than half way along it. Using a construction due to Fukaya-Oh-Ohta-Ono, we show that every rational polytope has a central point that is not displaceable by probes. In the monotone (or more generally, the reflexive) case, this central point is its unique interior integral point. In the monotone case, every other point is displaceable by probes if and only if the polytope satisfies the star Ewald condition. (This is a strong version of the Ewald conjecture concerning the integral symmetric points in the polytope.) Further, in dimensions up to and including three every monotone polytope is star Ewald. These results are closely related to the Fukaya-Oh-Ohta-Ono calculations of the Floer homology of the Lagrangian fibers of a toric symplectic manifold, and have applications to questions introduced by Entov-Polterovich about the displaceability of these fibers.
Submission history
From: Dusa McDuff [view email][v1] Fri, 10 Apr 2009 13:19:32 UTC (135 KB)
[v2] Wed, 28 Oct 2009 20:14:59 UTC (167 KB)
[v3] Fri, 26 Feb 2010 17:58:06 UTC (180 KB)
[v4] Sun, 24 Jul 2011 01:25:31 UTC (181 KB)
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