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arXiv 2104.02816math.DGmath.AP
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具有紧Cauchy曲面的渐近静态时空的一个指标定理

An index theorem on asymptotically static spacetimes with compact Cauchy surface

Dawei Shen, Michał Wrochna

摘要:

研究了具有奇维紧Cauchy曲面的渐近静态Lorentz流形上的Dirac算子。我们证明,如果Atiyah-Patodi-Singer边界条件施加在无限次,那么狄拉克算子是Fredholm。这推广了Bär-Strohmaier在有限时间情形下的一个定理,并且我们还证明了相应的指数公式推广到无限情形。此外,我们证明了存在的Fredholm逆,这是在同一时间的费曼参数的意义上的Duistermaat-Hörmander。证明结合了方法,从时间相关的散射理论与伪微分双曲型系统的叶戈罗夫定理的一个变种。

英文摘要:

We consider the Dirac operator on asymptotically static Lorentzian manifolds with an odd-dimensional compact Cauchy surface. We prove that if Atiyah-Patodi-Singer boundary conditions are imposed at infinite times then the Dirac operator is Fredholm. This generalizes a theorem due to Bär-Strohmaier in the case of finite times, and we also show that the corresponding index formula extends to the infinite setting. Furthermore, we demonstrate the existence of a Fredholm inverse which is at the same time a Feynman parametrix in the sense of Duistermaat-Hörmander. The proof combines methods from time-dependent scattering theory with a variant of Egorov's theorem for pseudo-differential hyperbolic systems.

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