Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-05-29
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
17 pages, 1 figure, LaTeX. Added simple derivation based on wavepackets
Scientific paper
Arguments based on general principles of quantum mechanics suggest that a minimum length or time associated with Planck-scale unification may entail a new kind of observable uncertainty in the transverse position of macroscopically separated bodies. Transverse positions vary randomly about classical geodesics in space and time by about the geometric mean of the Planck scale and separation, on a timescale corresponding to their separation. An effective theory based on a Planck information flux limit, and normalized by the black hole entropy formula, is developed to predict measurable correlations, such as the statistical properties of noise in interferometer signals. A connection with holographic unification is illustrated by representing Matrix theory position operators with a Schr\"odinger wave equation, interpreted as a paraxial wave equation with a Planck frequency carrier. Solutions of this equation are used to derive formulas for the spectrum of beamsplitter position fluctuations and equivalent strain noise in a Michelson interferometer, determined by the Planck time, with no other parameters. The spectral amplitude of equivalent strain derived here is a factor of \sqrt{\pi} smaller than previously published estimates. Signals in two nearly-collocated interferometers are predicted to be highly correlated, a feature that may provide convincing evidence for or against this interpretation of holography.
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