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For the past few months I have been studying $f(R)$ models of gravity. Recently I came cross $f(R, T)$ modified models of gravity. For the past few days I have tried to work out the difference between the two models. The problem is that while there are several models of $f(R)$ gravity, I couldn't find any models of $f(R,T)$ gravity. My question Are there any $f(R, T)$ models of gravity?

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  • $\begingroup$ By T, do you mean the stress energy tensor? $\endgroup$ – Slereah Jul 2 '15 at 10:11
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    $\begingroup$ The stress energy tensor itself derives from the Lagrangian, so it is a bit weird that it would be in the Lagrangian itself. $\endgroup$ – Slereah Jul 2 '15 at 11:56
  • $\begingroup$ $T$ in $f(T)$ is torsion $\endgroup$ – innisfree Jul 2 '15 at 13:11
  • $\begingroup$ @innisfree, I know that there $f(T)$ models and $f(R)$ models, but are there any models of $f(R, T)$ gravity. $\endgroup$ – MrDi Jul 2 '15 at 13:44
  • $\begingroup$ For more on torsion, see e.g. also this Phys.SE post. $\endgroup$ – Qmechanic Jul 11 '15 at 18:34

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