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arXiv 2301.07073math.DGmath-phmath.MP
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扩展 Ricci 流背景中的平均曲率流

Mean curvature flow in an extended Ricci flow background

José N. V. Gomes, Matheus Hudson

AI总结:

本文研究扩展 Ricci 流背景下的平均曲率流,分析加权 GHY 作用量及其变分与演化,推导几何量方程,并建立平均曲率孤立子的单调性公式、构造与刻画。

摘要:

在本文中,我们从 Lott 研究 Ricci 流背景中的平均曲率流时所引入的视角出发,考虑与环境空间中的平均曲率流相关的泛函,而该环境空间由扩展 Ricci 流演化。其中一个泛函是带边紧致流形上关于 Riemann 度量的 Gibbons-Hawking-York 作用量的加权扩展版本。我们计算了它的变分性质,并由此自然产生边界条件,以便在 Perelman 修改后的扩展 Ricci 流下分析其时间导数。例如,边界被积项为欧几里得空间中平均曲率流的 Hamilton 微分 Harnack 表达式提供了一种推广。我们还推导了扩展 Ricci 流背景下平均曲率流中第二基本形式和平均曲率二者的演化方程。在扩展 Ricci 流的梯度孤立子这一特殊情形中,我们讨论了平均曲率孤立子,并建立了 Huisken 单调性类型公式。我们展示了如何构造一族平均曲率孤立子,并建立了该族的一个刻画。此外,我们还展示了如何在扩展 Ricci 流背景中构造平均曲率孤立子的例子。

英文摘要:

In this paper, we consider functionals related to mean curvature flow in an ambient space which evolves by an extended Ricci flow from the perspective introduced by Lott when studying a mean curvature flow in a Ricci flow background. One of them is a weighted extended version of the Gibbons-Hawking-York action on Riemannian metrics in compact manifolds with boundary. We compute its variational properties from which naturally arise boundary conditions to the analysis of its time-derivative under Perelman's modified extended Ricci flow. For instance, the boundary integrand term provides an extension of Hamilton's differential Harnack expression for mean curvature flows in Euclidean space. We also derive the evolution equations for both the second fundamental form and the mean curvature under mean curvature flow in an extended Ricci flow background. In the special case of gradient solitons to the extended Ricci flow, we discuss mean curvature solitons and establish a Huisken's monotonicity-type formula. We show how to construct a family of mean curvature solitons and establish a characterization of such a family. Also, we show how for constructing examples of mean curvature solitons in an extended Ricci flow background.

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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