Tasks for expert:
- better explanation of motivation for theory, especially variable gravitational "constant" and Dirac large number hypothesis,
- explain Jordan "frame", Einstein "frame" [sic],
- write and link to background articles on decomposition of metric tensor (see Carroll; see problem book for utility in comparing gravitational radiation in Brans-Dicke and other theories with gtr),
- explain Faraoni critique (weak-field limit),
- add material comparing exact solutions in most important cases (plane waves, static spherically symmetric perfect fluid balls) and add a good citation