Two restrictions in the theories that include G(t) and c(t) varying with time

Autores UPV
Año
Revista Astrophysics and Space Science

Abstract

Much work has been done taking into account the possibility that the gravitational {\it constant} $G$ may vary with cosmological time $t$ (or with the cosmological scale factor $a(t)$). In many of these works the speed of light $c$ is not addressed or is taken as constant (see for example the Dirac large number hypothesis, \cite{Dirac}). The same can be said of many works that assume the speed of light $c$ to vary with cosmological time $t$ or $a(t)$ (see for example \cite{ MaMo}). Again in many of these works the gravitational constant $G$ is not addressed or is taken as constant. We have two important remarks on these assumptions.