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arXiv 1702.02044math.DGmath.SP
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奇维流形上的旋度算子

The curl operator on odd-dimensional manifolds

Christian Baer

摘要:

研究了奇维闭定向黎曼流形上旋度的谱性质。旋度是一个一阶线性微分算子,作用于适当次数的微分形式。在三维空间中,它的本征值是真空中无外源的电磁振荡频率。一般来说,谱由具有无限重数的本征值0和具有有限重数的实离散本征值组成。我们计算外尔渐近和研究zeta函数。我们给出了正曲流形的一个尖锐的特征值下界,并分析了等式的情况。最后,我们计算了平面环面、圆球和三维球面空间型的谱。

英文摘要:

We study the spectral properties of curl, a linear differential operator of first order acting on differential forms of appropriate degree on an odd-dimensional closed oriented Riemannian manifold. In three dimensions its eigenvalues are the electromagnetic oscillation frequencies in vacuum without external sources. In general, the spectrum consists of the eigenvalue 0 with infinite multiplicity and further real discrete eigenvalues of finite multiplicity. We compute the Weyl asymptotics and study the zeta-function. We give a sharp lower eigenvalue bound for positively curved manifolds and analyze the equality case. Finally, we compute the spectrum for flat tori, round spheres and 3-dimensional spherical space forms.

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