Primordial Black Hole Evolution in Tensor-Scalar Cosmology

A perturbative analysis shows that black holes do not remember the value of the scalar field $\varphi$ at the time they formed if $\varphi$ changes in tensor-scalar cosmology. Moreover, even when the black hole mass in the Einstein frame is approximately unaffected by the changing of $\varphi$, 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.