Response of the Unruh-DeWitt detector in a gravitational wave background
arXiv:2109.14183 · doi:10.1103/PhysRevD.105.024053
Abstract
Applying the techniques of light-front quantization to quantize a scalar field in a monochromatic gravitational wave background, we manage to investigate the response of the Unruh-DeWitt detector coupled to a scalar field in the presence of a gravitational wave for the two cases moving along a free-falling trajectory and a constant-accelerating trajectory. The transition rate of the Unruh-DeWitt detector, in both cases, is different from the result with no gravitational wave, and the leading-order correction due to the gravitational wave survives the long-wavelength limit that formally takes the wavelength of the gravitational wave to infinity. This new effect of the gravitational wave on a quantum system is qualitatively different from that on a classical mechanical system, and cannot be understood in terms of gravitational wave tidal force.
arXiv comment32 pages, 2 figures; contains some of the same material in arXiv:1605.06656; v2: various minor improvements made, version to appear in PRD
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