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arXiv 0908.0727math.DGmath.SGmath.SP
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从等变谱听Delzant多面体

Hearing Delzant polytopes from the equivariant spectrum

Emily B. Dryden, Victor Guillemin, Rosa Sena-Dias

摘要:

设M^{2n}是一个具有固定T^n-作用和环面Kähler度量g的辛环面流形。Abreu问是否频谱的拉普拉斯算子$Δ_g$对$\mathcal{C}^\infty(M)$决定的时刻多面体的M,因此,由Delzant定理确定M到symplectomorphism。我们报告的等变版本的这个猜想取得了一些进展。如果M^4的矩多边形是一般的,并且没有太多的平行边对,则M的所谓等变谱及其相关实流形M_R的谱决定了它的多边形,直到平移和少量的选择。对于任意偶数维的整数上同调类的M,作用在自然相伴线丛截面上的拉普拉斯算子的等变谱决定了M的矩多面体.

英文摘要:

Let M^{2n} be a symplectic toric manifold with a fixed T^n-action and with a toric Kähler metric g. Abreu asked whether the spectrum of the Laplace operator $Δ_g$ on $\mathcal{C}^\infty(M)$ determines the moment polytope of M, and hence by Delzant's theorem determines M up to symplectomorphism. We report on some progress made on an equivariant version of this conjecture. If the moment polygon of M^4 is generic and does not have too many pairs of parallel sides, the so-called equivariant spectrum of M and the spectrum of its associated real manifold M_R determine its polygon, up to translation and a small number of choices. For M of arbitrary even dimension and with integer cohomology class, the equivariant spectrum of the Laplacian acting on sections of a naturally associated line bundle determines the moment polytope of M.

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