Unruh–DeWitt detector

In theoretical physics, an Unruh–DeWitt detector is an idealized phenomenological model of a localized quantum probe used to operationalize the measurement of particles in curved or dynamical spacetimes. Introduced by William Unruh in 1976 to rigorously demonstrate the Unruh effect,[1] and subsequently generalized by Bryce DeWitt in 1979, the canonical model consists of a two-level quantum system coupled via a monopole scalar interaction to a background quantum field.[2]

The Unruh–DeWitt detector model serves as a foundational theoretical tool within quantum field theory in curved spacetime, providing a localized, algebraically defined observable that bypasses the ambiguities of global particle states when evaluating phenomena such as Hawking radiation and cosmological entanglement harvesting.[3] It places quantum information within a relativistic space time.

References

  1. ↑ Unruh, W. G. (August 1976). "Notes on black-hole evaporation". Physical Review D. 14 (4). American Physical Society: 870–892. doi:10.1103/PhysRevD.14.870.
  2. ↑ DeWitt, Bryce S. (1979). "Quantum gravity: the new synthesis". In Hawking, S. W.; Israel, W. (eds.). General Relativity: An Einstein Centenary Survey. Cambridge: Cambridge University Press. pp. 680–745. ISBN 0-521-22285-0.
  3. ↑ Wald, Robert M. (1994). Quantum Field Theory in Curved Spacetime and Black Hole Thermodynamics. Chicago: University of Chicago Press. ISBN 978-0-226-87027-4.
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