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Let Ḣ is a star graph of order S + 1, Ḃ ≜ ḂḢ,μ denote an arbitrary signed bipartite graph with Ḣ as a star complement for a non-main eigenvalue μ. In this paper, it is proved that Ḃ exists if and only if μ is an integer such that μ ∉ {-1, 0, ±√S} and S - μ2 is divisible by (μ + 1)2. The spectrum of Ḃ is given and the maximum order of Ḃ is 2S . It is proved that if μ is positive and the maximal signed graph Ḃ has adjacent vertices v1, v2 with the net-degree S, then Ḃ - v1 - v2 is net-regular. Furthermore, extremal signed graphs Ḃ are characterized in the case of μ = 1, S = 5 and μ = 2, S = 13. © 2024 SPIE.
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ISSN: 0277-786X
Year: 2024
Volume: 13219
Language: English
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 1
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