Graphs that have a weighted adjacency matrix with spectrum $\{λ_1^{n-2}, λ_1^2\}$

In this paper we completely characterize the graphs which have an edge weighted adjacency matrix belonging to the class of $n \times n$ involutions with spectrum equal to $\{ λ_1^{n-2}, λ_2^{2} \}$ for some $λ_1$ and some $λ_2$. The connected graphs turn out to be the cographs constructed as the join of at least two unions of pairs of complete graphs, and possibly joined with one other complete graph.

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