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### Are Quantum Fluctuations in Geometry a New Kind of Noise?

#### Abstract

Gravitational detectors in GEO600 experiment have been plagued by unidentified noise in the frequency range 300-1500 Hz. Craig J. Hogan has proposed an explanation in terms of holographic Universe. By reading the paper I learned that assumptions needed might be consistent with those of quantum TGD. Light-like 3-surfaces as basic objects, holography, effective 2-dimensionality, is some of the terms appearing repeatedly in the article. The model contains some unacceptable features such as Planck length as minimal wave length in obvious conflict with Lorentz invariance. Towards the end of year 2015, I realized that the diffraction analog serving as the starting point in Hogan's model cannot be justified in TGD framework. Fortunately, diffraction can be replaced by diffusion emerging very naturally in TGD framework and finally allowing one to understand how Planck length emerges from TGD framework, where

*CP*_{2}size is the fundamental length parameter. The noise can be also seen as support for the hierarchy of Planck constants.