Unicyclic signed graphs with maximal energy

Dijian Wang, Yaoping Hou

Let $x_1,x_2,\dots ,x_n$ be the eigenvalues of a signed graph $\Gamma$ of order $n$. The energy of $\Gamma$ is defined as $E(\Gamma )={\sum }_{j=1}^n|x_j|.$ Let ${\mathcal{P}}_n^4$ be obtained by c…