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How can we test quantum gravity?

26 May 2016, 13:11 UTC
How can we test quantum gravity?
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If you have good eyes, the smallest objects you can make out are about a tenth of a millimeter, roughly the width of a human hair. Add technology, and the smallest structures we have measured so far are approximately 10-19m, that’s the wavelength of the protons collided at the LHC. It has taken us about 400 years from the invention of the microscope to the construction of the LHC – 400 years to cross 15 orders of magnitude. Quantum effects of gravity are estimated to become relevant on distance scales of approximately 10-35m, known as the Planck length. That’s another 16 orders of magnitude to go. It makes you wonder whether it’s possible at all, or whether all the effort to find a quantum theory of gravity is just idle speculation.I am optimistic. The history of science is full with people who thought things to be impossible that have meanwhile been done: measuring the light deflection on the sun, heavier-than-air flying machines, detecting gravitational waves. Hence, I don’t think it’s impossible to experimentally test quantum gravity. Maybe it will take some decades, or maybe it will take some centuries – but if only we keep pushing, one day we will ...

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