University of IsfahanTransactions on Combinatorics2251-86573420141201Randic incidence energy of graphs19557310.22108/toc.2014.5573ENRan GuNankai UniversityFei HuangNankai UniversityXueliang LiCenter for Combinatorics, Nankai University, Tianjin 300071, ChinaJournal Article20140529Let $G$ be a simple graph with vertex set $V(G) = {v_1, v_2,ldots, v_n}$ and edge set $E(G) = {e_1, e_2,ldots, e_m}$. Similar to the Randi'c matrix, here we introduce the Randi'c incidence matrix of a graph $G$, denoted by $I_R(G)$, which is defined as the $ntimes m$ matrix whose $(i,j)$-entry is $(d_i)^{-frac{1}{2}}$ if $v_i$ is incident to $e_j$ and $0$ otherwise. Naturally, the Randi'c incidence energy $I_RE$ of $G$ is the sum of the singular values of $I_R(G)$. We establish lower and upper bounds for the Randic incidence energy. Graphs for which these bounds are best possible are characterized. Moreover, we investigate the relation between the Randic incidence energy of a graph and that of its subgraphs. Also we give a sharp upper bound for the Randic incidence energy of a bipartite graph and determine the trees with the maximum Randic incidence energy among all $n$-vertex trees. As a result, some results are very different from those for incidence energy.http://toc.ui.ac.ir/article_5573_68f2261c2087d1f09fb34c2f8de4b053.pdf