Non-squeezing and capacities for some calibrated geometries

Abstract

It was shown by Barron--Shafiee that an analogue of Gromov's non-squeezing theorem holds for affine maps which preserve a power $ω^k$ of the symplectic form $ω$ on $\mathbb{R}^{2n}$. In the present paper, we state and prove in two ways an improved version of their result which is closer to the classical affine non-squeezing theorem. One proof closely follows their argument, and the other consists of a reduction to the classical case by showing that, except for the case $k = n$, every linear map that preserves $ω^k$ must be symplectic or anti-symplectic. We then study when a calibration form satisfies an (affine) non-squeezing theorem. Particular focus is given to the special Lagrangian case, where we are able to establish an affine non-squeezing theorem for the holomorphic volume form $Ω= dz^1 \wedge \cdots \wedge dz^n$. The classical symplectic affine rigidity theorem states roughly that a non-singular linear map is symplectic or anti-symplectic if and only if it preserves the "capacity" of every ellipsoid. We establish an affine special Lagrangian version of this theorem under the necessary assumption that the map is complex-linear. We also discuss some natural future questions.