A harmonic map flow associated with the standard solution of Ricci flow

Details A harmonic map flow associated with the standard solution of Ricci flow A harmonic map flow associated with the standard solution of Ricci flow

2007-02-07

arxiv.org/abs/math/0702168v1

Mathematics

Differential Geometry

21 pages

Scientific paper

Let $(\Bbb{R}^n,g(t))$, $0\le t\le T$, $n\ge 3$, be a standard solution of the Ricci flow with radially symmetric initial data $g_0$. We will extend a recent existence result of P. Lu and G. Tian and prove that for any $t_0\in [0,T)$ there exists a solution of the corresponding harmonic map flow $\phi_t:(\Bbb{R}^n,g(t))\to (\Bbb{R}^n,g(t_0))$ satisfying $\partial \phi_t/\partial t=\Delta_{g(t),g(t_0)}\phi_t$ of the form $\phi_t(r,\theta) =(\rho (r,t),\theta)$ in polar coordinates in $\Bbb{R}^n\times (t_0,T_0)$, $\phi_{t_0}(r,\theta)=(r,\theta)$, where $r=r(t)$ is the radial co-ordinate with respect to $g(t)$ and $T_0=\sup\{t_1\in (t_0,T]: \|\widetilde{\rho}(\cdot ,t)\|_{L^{\infty}(\Bbb{R}^+)} +\|\partial\widetilde{\rho}/\partial r(\cdot ,t)\|_{L^{\infty}(\Bbb{R}^+)} <\infty\quad\forall t_0

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