Résumé / Abstract Seminaire_GReCO
SÉMINAIRE DU GRECO

"Quantum fluctuations of space-time"

Michael Maziashvili

Using a gedanken experiment providing presumably a minimal inaccuracy the uncertainty contributions to the space-time measurement are precisely evaluated for clock and mirror respectively. The resulting expression of minimal uncertainty for the space(time) interval indicates the presence of minimal Planck scale observable length(time). The synthesis of quantum mechanics and general relativity predicts the UV and IR scales for Lorentz invariance violation. The influence of background radiation on the space-time measurement is estimated. Based on the minimal length uncertainty relation which takes into account the wavelength of a quantum used for distance measurement we evaluate the cumulative factor responsible for the magnification of the space-time fluctuation induced phase incoherence of a light propagating over a large distance. In view of the interferometric observations the quantum fluctuations of space-time in the braneworld model are enormously increased if the fundamental scale is taken much below the Planck one. Present approach to the uncertainty in distance measurement leads to new insight about the bounds of computation. The space-time fluctuations affect the black hole physics as well.

jeudi 22 juin 2006 - 11:00
Salle des séminaires Évry Schatzman,
Institut d'Astrophysique de Paris

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