https://doi.org/10.1140/epjc/s10052-025-15144-3
Regular Article - Theoretical Physics
Dyonic Taub–NUT–AdS black branes: thermodynamics and phase diagrams
1
Department of Physics, Faculty of Science, Ain Shams University, 11566, Cairo, Egypt
2
Department of Physics, School of Sciences and Engineering, American University in Cairo, P.O. Box 74, AUC Avenue New Cairo, Cairo, Egypt
3
Centre for Theoretical Physics, The British University in Egypt, 11837, El Sherouk City, Egypt
a
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Received:
6
May
2025
Accepted:
3
December
2025
Published online:
12
December
2025
Motivated by the recent developments in the thermodynamics of Taub–NUT spaces and the absence of Misner strings in Taub–NUT solutions with flat horizons, we study the phase structure of the dyonic Taub–NUT solutions with Lorentzian signature. We follow the treatment proposed in arXiv:2206.09124 and arXiv:2304.06705 to introduce the NUT parameter as a conserved charge to the first law. Although the calculated quantities satisfy the first law, we have found a larger class of charges that satisfy the first law and depend on some arbitrary parameter 
. We choose to describe phase diagrams as NUT parameter-temperature graphs to show borders of big and small black brane phases. We study the phase structure of these spaces in a mixed ensemble (i.e., fixed electric potential, NUT charge, and magnetic charge), which we classify into different cases depending on the value of and the other quantities. Most of these cases not only have first-order phase transitions, but also, end at critical points. Some of these cases include up to four critical points, depending on the value of and the other quantities.
© The Author(s) 2025
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