  Recently, it was shown that the quantum effects of the matter, could be used
to determine the conformal degree of freedom of the space-time metric. So both
gravity and quantum are geometrical features. Gravity determines the causal
structure of the space-time, while quantum determines the scale of the
space-time. In this article, it is shown that it is possible to use the
scalar-tensor framework to build a unified theory in which both quantum and
gravitational effects are present.
