Gradient estimates for a nonlinear parabolic equation on Riemannian manifolds

Gradient estimates for a nonlinear parabolic equation on Riemannian manifolds
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黎曼流形上非线性抛物线方程的梯度估计

DOI:
10.1090/s0002-9939-08-09398-2
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发表时间:
2008-06
影响因子:
1
通讯作者:
Yang, Yunyan
Yang, Yunyan
中科院分区:
数学3区
文献类型:
--
作者:
Yang, Yunyan

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设M是完备非紧黎曼流形。考虑了一类非线性抛物型方程正解的梯度估计 $$ \frac{\partial u}{\partial t} = \Delta _{f}u +Au\,{\rm log}\,u + bu$$ on $${M \times [0,+ \infty)}$$,其中a,B是两个真实的常数,f是M上的光滑实值函数,$${\Delta_f = \Delta - \nabla f \nabla}$$。在假设N-Bakry-Emery Ricci张量由一个负常数下有界的条件下,得到了上述方程正解的梯度估计.作为应用,我们得到了一个Harnack不等式和这类方程热核的高斯下界。
AbstractLet M be a complete noncompact Riemannian manifold. We consider gradient estimates for the positive solutions to the following nonlinear parabolic equation $$ \frac{\partial u}{\partial t} = \Delta _{f}u +au\,{\rm log}\, u + bu$$ on $${M \times [0, + \infty)}$$, where a, b are two real constants, f is a smooth real-valued function on M and $${\Delta_f = \Delta - \nabla f \nabla}$$. Under the assumption that the N-Bakry-Emery Ricci tensor is bounded from below by a negative constant, we obtain a gradient estimate for positive solutions of the above equation. As an application, we obtain a Harnack inequality and a Gaussian lower bound of the heat kernel of such an equation.
完全非紧黎曼流形上非线性抛物线方程的梯度估计
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发表时间: 2009-06
影响因子: 0.7
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