The authors try to find some sort of equivalence principle for the interaction between scalar fields and other fields given stress-energy conservation alone. They suggest a coupling \[phi T_m\] I don't think they've found a real general result but it is an interesting question.
Also, in the spirit of last week:
Robust limit on a varying proton-to-electron mass ratio from a single H2 system by Wendt and Molaro link
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