Total energy of signed digraphs
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Astronomie. Astrofizică. Cercetarea spațiului. Geodezie (218)
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HAFEEZ, Sumaira; KHAN, Mehtab. Total energy of signed digraphs. In: Computer Science Journal of Moldova. 2021, nr. 1(85), pp. 105-134. ISSN 1561-4042.
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Computer Science Journal of Moldova
Numărul 1(85) / 2021 / ISSN 1561-4042

Total energy of signed digraphs

CZU: 529.6+004.891
MSC 2010: 05C35, 05C50.

Pag. 105-134

Hafeez Sumaira1, Khan Mehtab2
 
1 National University of Sciences and Technology (NUST),
2 Anhui University of Science and Technology
 
Disponibil în IBN: 24 aprilie 2021


Rezumat

The energy of a sidigraph is defined as the sum of absolute values of real parts of its eigenvalues. The iota energy of a sidigraph is defined as the sum of absolute values of imaginary parts of its eigenvalues. Recently a new notion of energy of digraphs is introduced which is called the total energy of digraphs. In this paper, we extend this concept of total energy to sidigraphs. We compute total energy formulas for negative directed cycles and show that the total energy of negative directed cycles with fixed order increases monotonically. We introduce complex adjacency matrix to give the integral representation for total energy of sidigraphs. We discuss the increasing property of total energy over some particular subfamilies of Sn,h, where Sn,h contains n-vertex sidigraphs with each cycle having length h. Using the CauchySchwarz inequality, we find upper bound for the total energy of sidigraphs. Finally, we find the class of noncospectral equienergetic sidigraphs.

Cuvinte-cheie
Signed Digraphs, Total energy, Increasing property, T-equienergetic sidigraphs

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<dc:creator>Hafeez, S.</dc:creator>
<dc:creator>Khan, M.</dc:creator>
<dc:date>2021-03-01</dc:date>
<dc:description xml:lang='en'><p>The energy of a sidigraph is defined as the sum of absolute values of real parts of its eigenvalues. The iota energy of a sidigraph is defined as the sum of absolute values of imaginary parts of its eigenvalues. Recently a new notion of energy of digraphs is introduced which is called the total energy of digraphs. In this paper, we extend this concept of total energy to sidigraphs. We compute total energy formulas for negative directed cycles and show that the total energy of negative directed cycles with fixed order increases monotonically. We introduce complex adjacency matrix to give the integral representation for total energy of sidigraphs. We discuss the increasing property of total energy over some particular subfamilies of Sn,h, where Sn,h contains n-vertex sidigraphs with each cycle having length h. Using the CauchySchwarz inequality, we find upper bound for the total energy of sidigraphs. Finally, we find the class of noncospectral equienergetic sidigraphs.</p></dc:description>
<dc:source>Computer Science Journal of Moldova 85 (1) 105-134</dc:source>
<dc:subject>Signed Digraphs</dc:subject>
<dc:subject>Total energy</dc:subject>
<dc:subject>Increasing property</dc:subject>
<dc:subject>T-equienergetic sidigraphs</dc:subject>
<dc:title><p>Total energy of signed digraphs</p></dc:title>
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