A short article that I’ve read today (via @seanmcarroll).
Title: “Using Cosmology to Establish the Quantization of Gravity”
Here is the abstract:
While many aspects of general relativity have been tested, and general principles of quantum dynamics demand its quantization, there is no direct evidence for that. It has been argued that development of detectors sensitive to individual gravitons is unlikely, and perhaps impossible. We argue here, however, that measurement of polarization of the Cosmic Microwave Background due to a long wavelength stochastic background of gravitational waves from Inﬂation in the Early Universe would ﬁrmly establish the quantization of gravity.