Quantum gravity signatures in the late Universe

We calculate deviations in cosmological observables as a function of parameters in a class of connection based models of quantum gravity. In this theory nontrivial modifications to the background cosmology can occur due to a distortion of the wave function of the Universe at the transition from matter to dark energy domination (which acts as a reflection in connection space). We are able to exclude some regions of parameter space and show with projected constraints that future experiments like DESI will be able to further constrain these models. An interesting feature of this theory is that there exists a region of parameter space that could naturally alleviate the S8 tension.

Automated summary

We calculate deviations in cosmological observables in a class of connection based models of quantum gravity and show that future experiments have the potential to further constrain these models, with the interesting possibility of alleviating the S8 tension.