Backreaction and the Unruh effect: New insights from exact solutions of uniformly accelerated detectors

Shih Yuin Lin, B. L. Hu

研究成果: Article

51 引文 (Scopus)

摘要

Using nonperturbative results obtained recently for a uniformly accelerated Unruh-DeWitt detector, we discover new features in the dynamical evolution of the detector's internal degree of freedom, and identified the Unruh effect derived originally from time-dependent perturbation theory as operative in the ultraweak coupling and ultrahigh acceleration limits. The mutual interaction between the detector and the field engenders entanglement between them, and tracing out the field leads to a mixed state of the detector even for a detector at rest in Minkowski vacuum. Our findings based on this exact solution show clearly the differences from the ordinary result where the quantum field's backreaction is ignored in that the detector no longer behaves like a perfect thermometer. From a calculation of the evolution of the reduced density matrix of the detector, we find that the transition probability from the initial ground state over an infinitely long duration of interaction derived from time-dependent perturbation theory is existent in the exact solution only in transient under special limiting conditions corresponding to the Markovian regime. Furthermore, the detector at late times never sees an exact Boltzmann distribution over the energy eigenstates of the free detector, thus in the non-Markovian regime covering a wider range of parameters the Unruh temperature cannot be identified inside the detector.

原文English
文章編號064008
期刊Physical Review D - Particles, Fields, Gravitation and Cosmology
76
發行號6
DOIs
出版狀態Published - 2007 九月 12

指紋

detectors
perturbation theory
Boltzmann distribution
thermometers
tracing
transition probabilities
eigenvectors
coverings
degrees of freedom
interactions
vacuum
ground state
temperature
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

引用此文

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