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arXiv math/0412321math.SPmath.CA
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扰动Dirac算子的二次估计和泛函演算

Quadratic estimates and functional calculi of perturbed Dirac operators

Andreas Axelsson, Stephen Keith, Alan McIntosh

摘要:

我们证明了Dirac型算子的复扰动的二次估计,从而证明了这种算子具有有界的谓词演算。作为一个应用程序,我们表明,谱投影的霍奇-狄拉克算子紧流形上的解析依赖于$L_\infty$变化的度量。我们还恢复了Calderón程序中的许多结果的统一证明,包括Kato平方根问题和Cauchy算子在Lipschitz曲线和曲面上的有界性。

英文摘要:

We prove quadratic estimates for complex perturbations of Dirac-type operators, and thereby show that such operators have a bounded functional calculus. As an application we show that spectral projections of the Hodge--Dirac operator on compact manifolds depend analytically on $L_\infty$ changes in the metric. We also recover a unified proof of many results in the Calderón program, including the Kato square root problem and the boundedness of the Cauchy operator on Lipschitz curves and surfaces.

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