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From the article:
wrote ... GEO 600, and its associated interferometric detectors, is the most sensitive scientific instrument ever designed. It can detect relative changes in distance of the order of 10-21, about the size of a single atom compared to the distance from the Sun to the Earth. It is designed to detect gravitational waves in the frequency range 50 Hz - 1.5 kHz.
(Emphasis mine) Does that sound relatively simple to you?
I read Wikipedia on holographic physics and it doesn't make any sense to me, but from your linked article it seems like they think they are measuring the noise spectrum of gravity. If gravity is indeed quantized then it makes sense that it would have a noise spectrum, much like electronic noise comes from the quantization of charge (at least some noise does, can't remember for sure if it's all noise). The shape of the spectrum would be of great interest in verifying quantum descriptions of gravity.
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Holographic universe?
