Quantum gravity experimental physics?
Canonical quantum gravity theories predict a polymer-like structure for space time at the Planck size. This granularity can be probed using gamma ray burst observations. Quantum gravity effects typically amount to corrections of Planck length size per wavelength. Because the distance to gamma ray burst is very large as measured in the wavelength of gamma rays, the effects accumulate and are on the brink of being observable. These observations can constrain certain aspects of the quantum state underlying our universe.
Publication Source (Journal or Book title)
General Relativity and Gravitation
Gambini, R., & Pullin, J. (1999). Quantum gravity experimental physics?. General Relativity and Gravitation, 31 (11), 1631-1637. https://doi.org/10.1023/A:1026701930767