Fig. 1: Excluded regions of parameter space from different experiments.
This figure depicts the values of the two quantum gravity parameters β0, α that are excluded based on experimental observations. Solid lines represent bounds obtained from experimental data and dashed lines represent expected bounds from proposed experiments. The shaded areas represent the region excluded by these experiments. The present work based on26 provides the largest excluded region of parameters which, in particular, excludes the key point β0 = 1, α = 0, thereby showing that suppression of quantum gravity deformations should be accounted for if β0 ~ 1 as expected from quantum gravity models. The proposal to use massive levitated diamagnetic objects described in the text promises significant improvement in bounds if the optimistic parameters required for such an experiment can be obtained.
