${\tilde{W}}^{1+}$ subclass: Extending the topological classification of black hole thermodynamics

Abstract

In this paper, we identify a novel topological subclass, dubbed ${\tilde{W}}^{1+}$, in the thermodynamics of higher odd-dimensional, multiply rotating Kerr-AdS black holes. This discovery extends the established topological classification beyond the five classes and two subclasses previously known. The ${\tilde{W}}^{1+}$ subclass exhibits a unique and previously unreported stability profile: it admits a thermodynamically stable small black hole state in the low-temperature limit, while in the high-temperature limit, the phase space simultaneously contains one stable large black hole, one stable small black hole, and one unstable small black hole state. Our analysis, which treats black hole solutions as topological defects, reveals a richer landscape of black hole thermodynamics than previously understood and necessitates an expansion of the topological classification scheme to accommodate this new phenomenology.

10 pages, 5 figures, 4 tables, to appear in PRD

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• Topology of black hole thermodynamics: A brief review
• Thermodynamic Topology and Photon Spheres Analysis of Black Holes in Brane-World: Insights from Barrow Entropy
• Four-charge static non-extremal black holes in the five-dimensional $\mathcal{N}=2$, $STU-W^{2}U$ supergravity
• Dimensional structure of thermodynamic topology in ultraspinning Kerr-AdS black holes
• Universal thermodynamic topological classes of the charged dRGT black string