  The energy, or mass scale M_SUSY, of the supersymmetry (SUSY) phase
transition is, as yet, unknown. If it is very high (i.e., ~ 10^3 GeV),
terrestrial accelerators will not be able to measure it. We determine M_SUSY
here by combining theory with the cosmic microwave background (CMB) data.
Starobinsky suggested an inflationary cosmological scenario in which inflation
is driven by quantum corrections to the vacuum Einstein's equation. The
modified Starobinsky model (MSM) is a natural extension of this. In the MSM,
the quantum corrections are the quantum fluctuations of the supersymetric
(SUSY) particles, whose particle content creates inflation and whose masses
terminate it. Since the MSM is difficult to solve until the end of the
inflation period, we assume here that an effective inflaton potential (EIP)
that reproduces the time dependence of the cosmological scale factor of the MSM
can be used to make predictions for the MSM. We predict the SUSY mass scale to
be M_SUSY ~ 10^15 GeV, thus satisfying the requirement that the predicted
density fluctuations of the MSM be in agreement with the observed CMB data.
