  It is likely that the holographic principle will be a consequence of the
would be theory of quantum gravity. Thus, it is interesting to try to go in the
opposite direction: can the holographic principle fix the gravitational
interaction? It is shown that the classical gravitational interaction is well
inside the set of potentials allowed by the holographic principle. Computations
clarify which role such a principle could have in lowering the value of the
cosmological constant computed in QFT to the observed one.
