Some sharp bounds on the distance signless Laplacian spectral radius of graphs

Research paper by Wenxi Hong, Lihua You

Indexed on: 15 Aug '13Published on: 15 Aug '13Published in: Mathematics - Combinatorics


M. Aouchiche and P. Hansen proposed the distance Laplacian and the distance signless Laplacian of a connected graph [Two Laplacians for the distance matrix of a graph, LAA 439 (2013) 21{33]. In this paper, we obtain three theorems on the sharp upper bounds of the spectral radius of a nonnegative matrix, then apply these theorems to signless Laplacian matrices and the distance signless Laplacian matrices to obtain some sharp bounds on the spectral radius, respectively. We also proposed a known result about the sharp bound of the signless Laplacian spectral radius has a defect.