Principal eigenvalue for an elliptic problem with indefinite weight on cylindrical domains

Pages: 315 - 335, Volume 5, Issue 2, April 2008

doi:10.3934/mbe.2008.5.315       Abstract        Full Text (463.3K)       Related Articles

Chiu-Yen Kao - Department of Mathematics, The Ohio State University, Columbus, OH 43210, United States (email)
Yuan Lou - Department of Mathematics, The Ohio State State University, Columbus, Ohio 43210, United States (email)
Eiji Yanagida - Mathematical Institute, Tohoku University, Sendai 980-8578, Japan (email)

Abstract: This paper is concerned with an indefinite weight linear eigenvalue problem in cylindrical domains. We investigate the minimization of the positive principal eigenvalue under the constraint that the weight is bounded by a positive and a negative constant and the total weight is a fixed negative constant. Biologically, this minimization problem is motivated by the question of determining the optimal spatial arrangement of favorable and unfavorable regions for a species to survive. Both our analysis and numerical simulations for rectangular domains indicate that there exists a threshold value such that if the total weight is below this threshold value, then the optimal favorable region is a circular-type domain at one of the four corners, and a strip at the one end with shorter edge otherwise.

Keywords:  principal eigenvalue, local minimizer, cylindrical domain.
Mathematics Subject Classification:  35P15, 35J20, 92D25.

Received: November 2007;      Accepted: February 2008;      Published: March 2008.