  It was recently advanced the argument that Unruh effect emerges from the
study of quantum field theory in quantum space-time. Quantum space-time is
identified with the Hilbert space of a new kind of quantum fields, the
accelerated fields, which are defined in momentum space. In this work, we argue
that the interactions between such fields offer a clear distinction between
flat and curved space-times. Free accelerated fields are associated with flat
spacetime, while interacting accelerated fields with curved spacetimes. Our
intuition that quantum gravity arises via field interactions is verified by
invoking quantum statistics. Studying the Unruh-like effect of accelerated
fields, we show that any massive object behaves as a black body at temperature
which is inversely proportional to its mass, radiating space-time quanta. With
a heuristic argument, it is shown that Hawking radiation naturally arises in a
theory in which space-time is quantized. Finally, in terms of thermodynamics,
gravity can be identified with an entropic force guaranteed by the second law
of thermodynamics.
