  We revisit the effective action of the Gribov-Zwanziger theory, taking into
due account the BRST symmetry and renormalization (group invariance) of the
construction. We compute at one loop the effective potential, showing the
emergence of BRST-invariant dimension 2 condensates stabilizing the vacuum.
This paper sets the stage at zero temperature, and clears the way to studying
the Gribov-Zwanziger gap equations, and particularly the horizon condition, at
finite temperature in future work.
