arXiv subjects
Publications and source records attributed to Aleksei Kislitsyn.
In this work we show that in general there is no Courant-like bound for Neumann domain count. In order to do that we construct a sequence of domains $\Omega^n$ such that the first Dirichlet eigenfunction for $\Omega^n$ has at least $n$ Neumann domains. Also a special case of convex domains is considered and sufficient conditions for existence of Courant-like bound for small eigenvalues are found.
A new approach for constructing minimal submanifolds of codimension 1 in the round spheres is proposed. In the case of $\mathbb{S}^3$ two immersions of the Clifford torus and all Lawson $\tau_{n, m}$ surfaces are described in terms of $(\lambda, \mu)$-eigenfunctions. Also, a new proof of a theorem that describes $(\lambda, \mu)$-eigenfunctions on sphere is obtained. This proof is based on a statement that a function $f$ is a $(\lambda, \mu)$-eigenfunction if and only if $f$ and $f^2$ are eigenfunctions for the Laplace-Beltrami operator.