arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.10376math.DG
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一类数量曲率边界里奇流的熵

The Entropy of Ricci Flows with Type-I Scalar Curvature Bounds

Max Hallgren

摘要:

本文推广了在有限时间奇点处满足I型数量曲率条件的里奇流理论。在[Bam16]中,Bamler证明了第一类重标度过程将产生一个奇异收缩梯度Ricci孤子,其奇点余维为4。我们证明了基于奇异时间的共轭热核的熵收敛于奇异孤子的孤子熵,并利用这一结果用热核密度函数刻画了里奇流解的奇异集.这推广了以前只知道与较强的假设的I型曲率界的结果。我们还证明了在4维情形下,奇异Ricci孤子在远离多个点处是光滑的,这些点是圆锥光滑轨道奇点

英文摘要:

In this paper, we extend the theory of Ricci flows satisfying a Type-I scalar curvature condition at a finite-time singularity. In [Bam16], Bamler showed that a Type-I rescaling procedure will produce a singular shrinking gradient Ricci soliton with singularities of codimension 4. We prove that the entropy of a conjugate heat kernel based at the singular time converges to the soliton entropy of the singular soliton, and use this to characterize the singular set of the Ricci flow solution in terms of a heat kernel density function. This generalizes results previously only known with the stronger assumption of a Type-I curvature bound. We also show that in dimension 4, the singular Ricci soliton is smooth away from finitely many points, which are conical smooth orbifold singularities

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