We review seven models which consistently couple quantum matter and (Newtonian) gravity in a nonstandard way. For each of them, we present the underlying motivations, the main equations, and, when available, a comparison with experimental data.
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Due to their smaller mass, the contribution from the electrons can be negligible compared to that of the atomic nuclei. Here, nucleons are taken as a fundamental constituent because the model is formulated in the non-relativistic regime; therefore, the energies are not high enough to resolve their structure.
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