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arXiv math/0606358math.DGmath-phmath.MP
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流形上具有稠密奇点的微分代数

Differential Algebras with Dense Singularities on Manifolds

Elemer E Rosinger

摘要:

最近,受广义相对论中稠密奇异性时空泡沫结构和量子引力理论的启发,广义函数的稠密奇异性时空泡沫微分代数被引入.这类代数的应用广泛,其中包括整体Cauchy-Kovalevskaia定理、抽象微分几何中的de Rham上同调等,而时空泡沫代数迄今为止只构造在欧几里得空间上.在本文中,由于它们在广义相对论中的相关性,这些代数的建设推广到任意有限维光滑流形。由于这些代数包含施瓦茨分布,将它们的构造扩展到流形也解决了定义流形上分布的长期悬而未决的问题,并且以与非线性运算兼容的方式这样做。早些时候,类似的尝试在文献中就延长Colombeau代数流形,代数也包含的分布。这些尝试遇到了重大的技术困难,由于增长条件类型的限制,Colombeau代数的元素必须满足近奇点。由于在本文中,没有任何类型的这种或其他增长条件所需的建设时空泡沫代数,其延伸到流形的收益在一个令人惊讶的简单和自然的方式。它还表明,时空泡沫代数形成一个罚款和松弛层,属性是重要的,在确保一个相当大的一类奇异性,广义函数可以处理。

英文摘要:

Recently the space-time foam differential algebras of generalized functions with dense singularities were introduced, motivated by the so called space-time foam structures in General Relativity with dense singularities, and by Quantum Gravity. A variety of applications of these algebras has been presented, among them, a global Cauchy-Kovalevskaia theorem, de Rham cohomology in abstract differential geometry, and so on. So far the space-time foam algebras have only been constructed on Euclidean spaces. In this paper, owing to their relevance in General Relativity among others, the construction of these algebras is extended to arbitrary finite dimensional smooth manifolds. Since these algebras contain the Schwartz distributions, the extension of their construction to manifolds also solves the long outstanding problem of defining distributions on manifolds, and doing so in ways compatible with nonlinear operations. Earlier, similar attempts were made in the literature with respect to the extension of the Colombeau algebras to manifolds, algebras which also contain the distributions. These attempts have encountered significant technical difficulties, owing to the growth condition type limitations the elements of Colombeau algebras have to satisfy near singularities. Since in this paper no any type of such or other growth conditions are required in the construction of space-time foam algebras, their extension to manifolds proceeds in a surprisingly easy and natural way. It is also shown that the space-time foam algebras form a fine and flabby sheaf, properties which are important in securing a considerably large class of singularities which generalized functions can handle.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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