Generalized $\Cal{L}$-geodesic and monotonicity of the generalized reduced volume in the Ricci flow

Details Generalized $\Cal{L}$-geodesic and monotonicity of the generalized reduced volume in the Ricci flow Generalized $\Cal{L}$-geodesic and monotonicity of the generalized reduced volume in the Ricci flow

2006-08-08

arxiv.org/abs/math/0608197v4

Mathematics

Differential Geometry

64 pages

Scientific paper

Suppose $M$ is a complete n-dimensional manifold, $n\ge 2$, with a metric $\bar{g}_{ij}(x,t)$ that evolves by the Ricci flow $\partial_t \bar{g}_{ij}=-2\bar{R}_{ij}$ in $M\times (0,T)$. For any $00$, we will prove the existence of a $\Cal{L}_p$-geodesic which minimize the $\Cal{L}_p(q,\bar{\tau})$-length between $p_0$ and $q$ for any $\bar{\tau}>0$. This result for the case $p=1/2$ is conjectured and used many times but no proof of it was given in Perelman's papers on Ricci flow. My result is new and answers in affirmative the existence of such $\Cal{L}$-geodesic minimizer for the $L_p(q,\tau)$-length which is crucial to the proof of many results in Perelman's papers on Ricci flow. We also obtain many other properties of the generalized $\Cal{L}_p$-geodesic and generalized reduced volume.

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