Key points are not available for this paper at this time.
A perturbative analysis shows that black holes do not remember the value of the scalar field at the time they formed if changes in tensor-scalar cosmology. Moreover, even when the black hole mass in the Einstein frame is approximately unaffected by the changing of, in the Jordan-Fierz frame the mass increases. This mass increase requires a reanalysis of the evaporation of primordial black holes in tensor-scalar cosmology. It also implies that there could have been a significant magnification of the (Jordan-Fierz frame) mass of primordial black holes.
Ted Jacobson (Mon,) studied this question.