李 瑞
(山西大學 數學科學學院 山西 太原 030006)
一類非局部(p,q)-Laplace方程非負解的存在性
李 瑞
(山西大學 數學科學學院 山西 太原 030006)
研究了RN中一類帶有非局部項的(p,q)-Laplace方程非負解的存在性.在f(x,t)滿足一定條件下,得到能量泛函Cerami序列的有界性,結合變分法證明了非負解的存在性.
(p,q)-Laplace方程; 非局部項; Cerami條件; 非負解
考慮帶有非局部項的(p,q)-Laplace方程,
(1)

(2)
當p=q>1時,方程(2)為單個p-Laplace方程.當p=q=2時,方程(2)為非線性Laplace方程
-Δu+au=f(x,u),x∈RN.
(3)
方程(2)是一般的反應擴散方程的穩定態情形,ut=div[D(u)u]+f(x,u),其中:u代表濃度;D(u)q-2,是擴散系數;f(x,u)是反應項.這類方程在物理、生物和化學中都有廣泛的應用[1-4].文獻[5]研究了方程(3)正解的存在性,a>0為常數.由于(p,q)-Laplace算子是非齊次的,處理一般橢圓方程的方法不再適用,文獻[4,6-7]中作者運用不同的方法得到了方程(2)非平凡解的存在性.文獻[4]考慮了(RN)的情形.文獻[6]考慮了1 本文探究帶有非局部項的(p,q)-Laplace方程非平凡解的存在性.其中f滿足如下條件: (f1)f(x,t)是一個Carathéodory函數滿足:f(x,0)=0,當t>0時F(x,t)>0.其中, 定理1 令2≤q 引理1Wp,a,h是自反的Banach空間,當s∈[p,p*]時,Wp,a,h→Ls(RN)為連續嵌入,當s∈[p,p*)時為緊嵌入.Wq,b,g的性質類似可得[6]. 注1 通過直接計算,并運用H?lder不等式,對任意u∈Wp,a,h,線性泛函φ∈Ep,a,hφφ)∈R是有界的,且有.定義賦范空間W=Wp,a,h∩Wq,b,g,及范數.由W的定義及引理1直接可得. 推論1W是自反的Banach空間,當s∈[q,p*]時,W→Ls(RN)為連續嵌入,當s∈[q,p*)時為緊嵌入. 序列{un}?W稱為是C1泛函I:W→R的Cerami序列,如果滿足: (C)I的任意Cerami序列在W中都有收斂子列. 用比較弱的(C)條件代替(PS)條件,定量形變引理仍成立[10].在假設(C)條件成立的情況下,山路定理也成立[11].因此,如果C1泛函I:W→R滿足(C)條件及山路幾何條件,則I在W中有一個臨界點. 定義 引理2I+滿足(C)條件. 證明 令{un}?W為I+的Cerami序列,則 (4) 其中K為某個不依賴于n的正常數,且 (5) (6) (7) 記 (8) 故有 (9) 由式(7)、(8)得 (10) (11) 從而可得 (12) (13) (14) 從而 由上式可得 (15) 而由式(10)可知 (16) ∫f+(x,un)(un-u)→0. (17) 對任意u∈W,由注1線性泛函φ∈W〈-Δpu,φ〉∈R,φ∈W〈-Δqu,φ〉∈R,φ∈W〈hΨpu,φ〉∈R,φ∈W〈gΨqu,φ〉∈R都有界.在W中un弱收斂于u,從而有.由算子-Δp,-Δq,hΨp,gΨq的單調性可得 hΨp(u)+gΨq(u),un-u〉, 〈-aΔpun-bΔqun+hΨp(un)+gΨq(un),un-u〉-〈-aΔpu-bΔqu+hΨp(u)+gΨq(u),un-u〉= 〈-aΔpun,un-u〉-〈-aΔpu,un-u〉+〈-bΔqun,un-u〉-〈-bΔqu,un-u〉+〈hΨp(un),un-u〉- 引理3 存在R,ρ>0使得 證明 (i) 令r∈(2p,p*).由條件(f2)、(f5),對任意ε>0,存在Cε>0使得 則 定理1的證明 由引理3,I+滿足山路幾何條件,結合引理2,存在0≠u∈W,對任意φ∈W滿足 [1] GIOVANY M F. Existence of positive solutions for a class ofp&qelliptic problems with critical growth on RN[J]. Math Anal Appl, 2011,378(2):507-518. [2] HE C J, LI G B. The regularity of weak solutions to nonlinear scalar field elliptic equations containingp&q-Laplacians[J]. Ann Acad Sci Fenn Math, 2008,33(2):337-371. [3] LI G B, LIANG X Y. The existence of nontrivial solutions to nonlinear elliptic equation ofp-q-Laplacian type on RN[J]. Nonlinear Anal, 2009,71(5/6):2316-2334. [4] WU M, YANG Z D. A class ofp-q-Laplacian type equation with potentials eigenvalue problem in RN[J]. Bound Value Probl, 2009(1):429-436.185319. [5] LI G B, ZHOU H S. The existence of a positive solution to asymptotically linear scalar field equations[J]. Proc Roy Soc Edinburgh Sect A, 2000,130(1):81-105. [6] CHAVES M F, ERCOLE G, MIYAGAKI O H. Existence of a nontrivial solution for the (p,q)-Laplacian in RNwithout the Ambrosetti-Rabinowitz condition[J]. Nonlinear Anal, 2015,114:133-141. [7] HE C J, LI G B. The existence of a nontrivial solution to the (p,q)-Laplacian problem with nonlinearity asymptotic toup-1at infinity in RN[J]. Nonlinear Anal, 2008,68(5):1100-1119. [8] 高婷梅.含有一個參數的p-拉普拉斯方程正解的存在性[J].鄭州大學學報(理學版),2014,46(3):9-12. [9] BEN-NAOUM A K, TROESTLER C, WILLEM M. Extrema problems with critical Sobolev exponents on unbounded domains[J]. Nonlinear Anal, 1996,26(4):823-833. [10] BERESTYCKI H, LIONS P L. Nonlinear scalar field equations. II. Existence of infinitely many solutions[J]. Arch Rational Mech Anal, 1983,82(4):347-375. [11] NIKOLAOS C K, NIKOLAOS S P. Nonsmooth critical point theory and nonlinear elliptic equations at resonance[J]. J Austral Math Soc Ser A, 2000,23(2):245-271. [12] DAMASCELLI L. Comparison theorems for some quasilinear degenerate elliptic operators and applications to symmetry and monotonicity results[J]. Ann Inst H Poincare Anal Non Lineaire, 1998,15(4):493-516. (責任編輯:方惠敏) Existence of Nonnegative Solution to a Class of (p,q)-Laplacian Equation LI Rui (SchoolofMathematicalSciences,ShanxiUniversity,Taiyuan030006,China) The existence of nonnegative solution to a class of (p,q)-Laplacian equation in RNwas studied. Under the assumptions off(x,t), the boundedness of the Cerami sequence of energy function was obtained. Combining variational method, the existence of the nonnegative solution was extended. (p,q)-Laplacian equation; nonlocal term; Cerami condition; nonnegative solution 2015-11-06 國家自然科學基金資助項目(11071149,11301313,11101250);山西省自然科學基金資助項目(2014021009-1, 2015021007). 李瑞(1990—), 女,山西呂梁人,碩士研究生,主要從事非線性泛函分析與非線性微分方程研究,E-mail:rli1990@sina.com. 李瑞.一類非局部(p,q)-Laplace方程非負解的存在性[J].鄭州大學學報(理學版),2016,48(2):5-10. O175.2;O177 A 1671-6841(2016)02-0005-06 10.13705/j.issn.1671-6841.2015231



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