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arXiv 0903.3068math.AP
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完全非线性齐次抛物型方程的长时间渐近性

Long-time asymptotics for fully nonlinear homogeneous parabolic equations

Scott N. Armstrong, Maxim Trokhimtchouk

摘要:

在正齐次算子$F$不变号且在无穷远处有充分衰减的假设下,研究了在初始条件$u(x,0) = g(x)$下,一致抛物方程\[ u_t + F(D^2u) = 0 \quad {in} \R^n\times \R_+, \]解的长时间渐近性.证明了满足自相似关系\[ Φ^\pm (x,t) = λ^{α^\pm} Φ^\pm (λ^{1/2} x, λt). \]的Cauchy问题的正解$Φ^+$和负解$Φ^-$的存在性.证明了具有非负(非正)初值的Cauchy问题解的重标极限在$\R^n \times \R_+$中局部一致收敛于$Φ^+$($Φ^-$).反常指数$α^+$和$α^-$被确定为与$\R^n$中的$F$相关联的某个椭圆算子的主半特征值。

英文摘要:

We study the long-time asymptotics of solutions of the uniformly parabolic equation \[ u_t + F(D^2u) = 0 \quad {in} \R^n\times \R_+, \] for a positively homogeneous operator $F$, subject to the initial condition $u(x,0) = g(x)$, under the assumption that $g$ does not change sign and possesses sufficient decay at infinity. We prove the existence of a unique positive solution $Φ^+$ and negative solution $Φ^-$, which satisfy the self-similarity relations \[ Φ^\pm (x,t) = λ^{α^\pm} Φ^\pm (λ^{1/2} x, λt). \] We prove that the rescaled limit of the solution of the Cauchy problem with nonnegative (nonpositive) initial data converges to $Φ^+$ ($Φ^-$) locally uniformly in $\R^n \times \R_+$. The anomalous exponents $α^+$ and $α^-$ are identified as the principal half-eigenvalues of a certain elliptic operator associated to $F$ in $\R^n$.

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