On Gradient Estimates for a Nonlinear Parabolic Equation on Riemannian Manifolds

On Gradient Estimates for a Nonlinear Parabolic Equation on Riemannian Manifolds
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发表时间:
2010
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通讯作者:
B. Qian
B. Qian
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其他
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作者:
B. Qian

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设(M,g)是完备的非紧黎曼流形.本文在M ×(0,∞)上得到了一个简单的非线性抛物型方程ξ tu =Δ u + Au log u + bu正解的局部梯度估计,其中a,B为常数.该方程与梯度Ricci孤子密切相关。本文简化和改进了Y. Yang(Proc. AMS,136(2008),4095-4102)。
Let (M, g) be a complete noncompact Riemannian manifold. In this note, we derive a local gradient estimate for positive solution to a simple nonlinear parabolic equation ∂tu =Δ u + au log u + bu, on M × (0, ∞), where a, b are constants. This equation is closely related to the gradient Ricci soliton. We simplify and improve the result obtained by Y. Yang (Proc. AMS, 136 (2008), 4095-4102).