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On the optimization of the first weighted eigenvalue

Published online by Cambridge University Press:  12 September 2022

Nirjan Biswas
Affiliation:
Tata Institute of Fundamental Research, Centre For Applicable Mathematics, Post Bag No 6503, Sharada Nagar, Bangalore, 560065, India (nirjan22@tifrbng.res.in)
Ujjal Das
Affiliation:
Department of Mathematics, Technion - Israel Institute of Technology, Haifa, 32000, Israel (ujjal.rupam.das@gmail.com)
Mrityunjoy Ghosh
Affiliation:
Department of Mathematics, Indian Institute of Technology Madras, Chennai, 600036, India (ghoshmrityunjoy22@gmail.com)

Abstract

For $N\geq 2$, a bounded smooth domain $\Omega$ in $\mathbb {R}^{N}$, and $g_0,\, V_0 \in L^{1}_{loc}(\Omega )$, we study the optimization of the first eigenvalue for the following weighted eigenvalue problem:

\[ -\Delta_p \phi + V |\phi|^{p-2}\phi = \lambda g |\phi|^{p-2}\phi \text{ in } \Omega, \quad \phi=0 \text{ on } \partial \Omega, \]
where $g$ and $V$ vary over the rearrangement classes of $g_0$ and $V_0$, respectively. We prove the existence of a minimizing pair $(\underline {g},\,\underline {V})$ and a maximizing pair $(\overline {g},\,\overline {V})$ for $g_0$ and $V_0$ lying in certain Lebesgue spaces. We obtain various qualitative properties such as polarization invariance, Steiner symmetry of the minimizers as well as the associated eigenfunctions for the case $p=2$. For annular domains, we prove that the minimizers and the corresponding eigenfunctions possess the foliated Schwarz symmetry.

Type
Research Article
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Royal Society of Edinburgh

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