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Energy of Graphs

Author(s): Harishchandra S. Ramane (Karnatak University, India)
Copyright: 2020
Pages: 30
Source title:
Handbook of Research on Advanced Applications of Graph Theory in Modern Society
Source Author(s)/Editor(s): Madhumangal Pal (Vidyasagar University, India), Sovan Samanta (Tamralipta Mahavidyalaya, India) and Anita Pal (National Institute of Technology Durgapur, India)
DOI: 10.4018/9781522593805.ch011
PurchaseView Energy of Graphs on the publisher's website for pricing and purchasing information.

Abstract
The energy of a graph G is defined as the sum of the absolute values of the eigenvalues of its adjacency matrix. The graph energy has close correlation with the total pielectron energy of molecules calculated with Huckel molecular orbital method in chemistry. A graph whose energy is greater than the energy of complete graph of same order is called hyperenergetic graph. A noncomplete graph having energy equal to the energy of complete graph is called borderenergetic graph. Two noncospectral graphs are said to be equienergetic graphs if they have same energy. In this chapter, the results on graph energy are reported. Various bounds for graph energy and its characterization are summarized. Construction of hyperenergetic, borderenergetic, and equienergetic graphs are reported.
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