  One of the most disturbing difficulties in thinking about the cosmological
constant is that it is not stable under radiative corrections. The feedback
mechanism proposed in [hep-th/0306108] is a dynamical way to protect a zero or
small cosmological constant against radiative corrections. Hence, while this by
itself does not solve the cosmological constant problem, it can help solving
the problem. In the present paper we investigate stability and gravity in this
approach and show that the feedback mechanism is both classically and quantum
mechanically stable and has self-consistent, stable dynamics.
