Laplacian Spectral Characterization of Signed Sun Graphs

Abstract

A sun SGn is a graph of order 2n consisting of a cycle Cn, n ≥ 3, to each vertex of it a pendant edge is attached. In this paper, we prove that unbalanced signed sun graphs are determined by their Laplacian spectra. Also we show that a balanced signed sun graph is determined by its Laplacian spectrum if and only if n is odd.

Keywords

• signed graph
• sun graph
• laplacian eigenvalues