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arXiv 1607.08558math.DGmath.AP
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里奇流与体积重整化

Ricci Flow and Volume Renormalizability

Eric Bahuaud, Rafe Mazzeo, Eric Woolgar

摘要:

对于任何特殊的边界定义函数,共形紧的渐近双曲度量在其共形无穷远点附近有一个渐近展开。如果这种膨胀是均匀的,并且满足一个额外的条件,那么就有可能定义它的重整化体积,并表明它与保持这种均匀结构的选择无关。我们证明了这种展开式在正规化里奇流下是保持的。我们还研究了曲率泛函在这种情况下的变化,并作为一个应用,得到了变化公式$$ \frac{\rm d}{{\rm d}t} {\rm RenV}\big(M^n, g(t)\big) = -\mathop{\vphantom{T}}^R \! \! \! \int_{M^n} (S(g(t))+n(n-1)) {\rm d}V_{g(t)},$$,其中$S(g(t))$是演化度量$g(t)$的数量曲率,$\mathop{\vphantom{T}}^R \! \! \! \int (\cdot) {\rm d}V_g$是Riesz重整化.这将我们早期的工作扩展到更广泛的度量类别。

英文摘要:

With respect to any special boundary defining function, a conformally compact asymptotically hyperbolic metric has an asymptotic expansion near its conformal infinity. If this expansion is even to a certain order and satisfies one extra condition, then it is possible to define its renormalized volume and show that it is independent of choices that preserve this evenness structure. We prove that such expansions are preserved under normalized Ricci flow. We also study the variation of curvature functionals in this setting, and as one application, obtain the variation formula $$ \frac{\rm d}{{\rm d}t} {\rm RenV}\big(M^n, g(t)\big) = -\mathop{\vphantom{T}}^R \! \! \! \int_{M^n} (S(g(t))+n(n-1)) {\rm d}V_{g(t)},$$ where $S(g(t))$ is the scalar curvature for the evolving metric $g(t)$, and $\mathop{\vphantom{T}}^R \! \! \! \int (\cdot) {\rm d}V_g$ is Riesz renormalization. This extends our earlier work to a broader class of metrics.

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