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Quantum scalar field theory on equal-angular-momenta Myers-Perry-AdS black holes

Alessandro Monteverdi* and Elizabeth Winstanley†

  • School of Mathematical and Physical Sciences, The University of Sheffield, Hicks Building, Hounsfield Road, Sheffield. S3 7RH United Kingdom

  • *Contact author: AMonteverdi1@sheffield.ac.uk
  • †Contact author: E.Winstanley@sheffield.ac.uk
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Phys. Rev. D 112, 125014 – Published 8 December, 2025

DOI: https://doi.org/10.1103/414f-xxrk

Abstract

We study the canonical quantization of a massive scalar field on a five dimensional, rotating black hole spacetime. We focus on the case where the spacetime is asymptotically anti-de Sitter and the black hole’s two angular momentum parameters are equal. In this situation the geometry possesses additional symmetries which simplify both the mode solutions of the scalar field equation and the stress-energy tensor. When the angular momentum of the black hole is sufficiently small that there is no speed-of-light surface, there exists a Killing vector which is timelike in the region exterior to the event horizon. In this case classical superradiance is absent and we construct analogs of the usual Boulware and Hartle-Hawking quantum states for the quantum scalar field. We compute the differences in expectation values of the square of the quantum scalar field operator and the stress-energy tensor operator between these two quantum states.

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Phys. Rev. D 112, 125014– Published 8 December, 2025
  • Received 24 June 2025
  • Accepted 18 October 2025
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