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Effets physiques des fonds d'ondes gravitationnelles : décohérence intrinsèque dans les interféromètres

Abstract : The direct detection of gravitational waves using large interferometers is part of a huge
international effort. These detectors will look for signals, but besides these signals, it exists gravitational waves
backgrounds extending on a large frequency band. These backgrounds are predicted by astrophysical and cosmological
models describing the evolution of the Universe and constitute an essential part of our gravitational environment. In
this thesis, we study their effects on coherence properties of physical systems. The interaction with these backgrounds
causes a decoherence mechanism that we study using the Feynman-Vernon functional influence approach. The effect is
shown to be negligible for microscopic systems such as atoms or photons circulating in interferometers, but becomes
important for macroscopic systems such as the motion of the center of mass of the Moon for example. We also address the
question whether this gravitational decoherence could be experimentally observed using a mesoscopic system in which
decoherence could be monitored. In this thesis, we deliver an exactly solvable model characterizing the quantum
classical transition induced by gravitational fluctuations of spacetime.
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Contributor : Brahim Lamine <>
Submitted on : Tuesday, September 21, 2004 - 5:21:29 PM
Last modification on : Monday, December 14, 2020 - 9:51:16 AM
Long-term archiving on: : Friday, April 2, 2010 - 8:39:56 PM


  • HAL Id : tel-00006936, version 1


Brahim Lamine. Effets physiques des fonds d'ondes gravitationnelles : décohérence intrinsèque dans les interféromètres. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2004. Français. ⟨tel-00006936⟩



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