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It is argued that the time-of-arrival cannot be precisely defined and measured in quantum mechanics. By constructing explicit toy models of a measurement, we show that for a free particle it cannotâ€¦ (More)

- Silke E. Ch. Weinfurtner, Edmund W Tedford, Matthew C J Penrice, W. G. Unruh, Gregory A. Lawrence
- Physical review letters
- 2011

Hawking argued that black holes emit thermal radiation via a quantum spontaneous emission. To address this issue experimentally, we utilize the analogy between the propagation of fields around blackâ€¦ (More)

- W. G. Unruh
- 2008

The naive calculation of black hole evaporation makes the thermal emission depend on the arbitrary high frequency behaviour of the theory where the theory is certainly wrong. Using the sonic analogâ€¦ (More)

- R. SchÃ¼tzhold, W. G. Unruh
- Physical review letters
- 2005

It is demonstrated that the propagation of electromagnetic waves in an appropriately designed waveguide is (for large wavelengths) analogous to that within a curved space-time--such as around a blackâ€¦ (More)

- W. G. Unruh
- 1993

The role that time plays in Einstein's theory of gravity and in quantum mechanics is described, and the difficulties that these conflicting roles present for a quantum theory of gravity areâ€¦ (More)

- W. G. Unruh
- Philosophical transactions. Series Aâ€¦
- 2008

The use of sonic analogues to black and white holes, called dumb or deaf holes, to understand the particle production by black holes is reviewed. The results suggest that the black hole particleâ€¦ (More)

- W. G. Unruh, Robert M. Wald
- Reports on progress in physics. Physical Society
- 2017

The complete gravitational collapse of a body in general relativity will result in the formation of a black hole. Although the black hole is classically stable, quantum particle creation processesâ€¦ (More)

Within quantum mechanics it is possible to assign a probability to the chance that a measurement has been made at a specific time t. However, the interpretation of such a probability is far fromâ€¦ (More)

This paper presents an exact solution to the long wavelength perturbations for the scalar modes and for a scalar field theory with arbitrary potential. Locally these modes are coordinateâ€¦ (More)

- W. G. Unruh
- 1998

This paper presents an analysis of the radiation seen by an observer in circular acceleration, for a magnetic spin. This is applied to an electron in a storage ring, and the subtilty of theâ€¦ (More)