On the distance spectral radius bounds and improved bounds on the spectral radius of power graphs of some finite groups

Abstract: We consider the group G and construct its power graph, whose vertex set consists of the elements of G. Two distinct vertices (elements) are adjacent in the graph if and only if one element can be expressed as an integral power of the other. In the paper (Indagationes Mathematicae 29(2) (2018), pp 730 t0 737), Chattopadhyay et al. gave spectral radius bounds of the power graph of certain finite groups. In this article, we improved the bounds of the spectral radius of the power graphs of the above results. Furthermore, we provide bounds for the distance spectral radius of the power graph of the cyclic group Cn, the dihedral group D2n, and the dicyclic group Q4n. For some cases, we find the bounds are exact if and only if they pertain to a particular family of graphs.