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首页> 外文期刊>SIAM Journal on Mathematical Analysis >ASYMPTOTIC BEHAVIOR OF THE PRINCIPAL EIGENVALUE OF A LINEAR SECOND ORDER ELLIPTIC OPERATOR WITH SMALL/LARGE DIFFUSION COEFFICIENT
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ASYMPTOTIC BEHAVIOR OF THE PRINCIPAL EIGENVALUE OF A LINEAR SECOND ORDER ELLIPTIC OPERATOR WITH SMALL/LARGE DIFFUSION COEFFICIENT

机译:小于/大扩散系数的线性二阶椭圆术术的主要特征值的渐近行为

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In this article, we are concerned with the following eigenvalue problem of a second order linear elliptic operator: - D Delta phi - 2 alpha del m(x) . del phi + V(x)phi = lambda phi in Omega, complemented by a general boundary condition, including Dirichlet boundary condition and Robin boundary condition, On partial derivative phi/partial derivative n + beta(x)phi = 0 on partial derivative Omega, where beta is an element of C(partial derivative Omega) is allowed to be positive, sign-changing, or negative, and n(x) is the unit exterior normal to partial derivative Omega at x. The domain Q subset of R-N is bounded and smooth, the constants D > 0 and alpha > 0 are, respectively, the diffusive and advection coefficients, and m is an element of C-2 ((Omega) over bar), V is an element of C((Omega) over bar) are given functions. We aim to investigate the asymptotic behavior of the principal eigenvalue of the above eigenvalue problem as the diffusive coefficient D -> 0 or D -> infinity. Our results, together with those of [X. F. Chen and Y. Lou, Indiana Univ. Math. J., 61 (2012), pp. 45-80; A. Devinatz, R. Ellis, and A. Friedman, Indiana Univ. Math. J., 23 (1973/74), pp. 991-1011; and A. Friedman, Indiana U. Math. J., 22 (1973), pp. 1005-1015] where the Neumann boundary case (i.e., beta = 0 on partial derivative Omega) and Dirichlet boundary case were studied, reveal the important effect of advection and boundary conditions on the asymptotic behavior of the principal eigenvalue.
机译:在本文中,我们涉及二阶线性椭圆型操作员的以下特征值问题: - D Delta Phi - 2 Alpha Del M(x)。 Del Phi + V(x)Phi =ωppi在ω的emga,包括一般边界条件,包括Dirichlet边界条件和罗宾边界条件,在部分衍生ω的部分衍生PHI /部分衍生N + Beta(x)Phi = 0上,β是C(部分衍生ω)的元素,允许阳性,符号变化或负,n(x)是X的局部衍生ω的单元外部。 RN的域Q子集是有界和光滑的,常数D> 0和alpha> 0分别是扩散和平坦系数,M是C-2((ω)的元素,V是一个C((ω)的元素为函数。我们的目标是探讨上述特征值问题的主要特征值的渐近行为作为扩散系数d - > 0或d - >无穷大。我们的结果与[X. F.陈和Y.娄,印第安纳州大学。数学。 J.,61(2012),PP。45-80; A. Devinatz,R. Ellis和A. Friedman,印第安纳州大学。数学。 J.,23(1973/74),PP。991-1011;和A.弗里德曼,印第安纳州U.数学。 J.,22(1973),PP。1005-1015]在其中研究了Neumann边界壳体(即,部分衍生物Omega上的Beta = 0)和Dirichlet边界案例,揭示了平流和边界条件对渐近行为的重要作用主要特征值。

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