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  • Open Access

Quantum superposition of boundary conditions in PAdS2

João P. M. Pitelli1,*, Bruno S. Felipe2,†, Claudio Dappiaggi3,‡, and Elizabeth Winstanley4,§

  • *Contact author: pitelli@unicamp.br
  • †Contact author: brunfeli@ifi.unicamp.br
  • ‡Contact author: claudio.dappiaggi@unipv.it
  • §Contact author: e.winstanley@sheffield.ac.uk
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Phys. Rev. D 111, 125011 – Published 16 June, 2025

DOI: https://doi.org/10.1103/3nfv-lhs1

Abstract

We explore the quantum superposition of boundary conditions in the context of the Poincaré patch of the two-dimensional anti–de Sitter space. Focusing on Robin (mixed) boundary conditions, we investigate the response function of the Unruh-DeWitt (UDW) detector interacting with two or more scalar fields, each respecting a different boundary condition. The role of this quantum superposition is twofold: (i) it may represent different fields propagating on the same spacetime and interacting with an UDW detector or (ii) it may describe an UDW detector on a superposition of spacetimes, each one with an inequivalent propagating field.

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Phys. Rev. D 111, 125011– Published 16 June, 2025
  • Received 11 March 2025
  • Accepted 30 May 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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