The energy , or mass scale M _ { SUSY } , of the supersymmetry ( SUSY ) phase transition is , as yet , unknown .
If it is very high ( i.e. , \gg 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 } \simeq 10 ^ { 15 } { GeV } , thus satisfying the requirement that the predicted density fluctuations of the MSM be in agreement with the observed CMB data .