minima (at 〈 ψ 〉 = 0) in which the field σ , identified as the inflaton from now on, lies in a flat direction, V$_{tree}$ = V$_{0}$ ≡ κ $^{2}$M$^{4}$. This non-vanishing value of the potential both sustain the inflationary dynamics and induces a SUSY breaking. Chaotic initial conditions are usually assumed [62], which provide for a large inflaton VEV at the “beginning” of inflation (We will return later to the issue of initial conditions in this model). The end of inflation is then triggered by slow-roll violation and the system rapidly settles at the bottom of one of the global minima, breaking the symmetry G , potentially forming topological defects, and restoring SUSY. Since, V ( ψ = 0) = 0, SUSY is broken. This induces a splitting in the mass of the fermionic and bosonic components of the superfields Φ and Φ, with m 2 $_{B}$( S ) = κ $^{2}$| S | 2 ± κ $^{2}$M2 and m 2 F = κ $^{2}$| S | $^{2}$. Note that this description is valid only as long as S is sufficiently slow- rolling such that κ $^{2}$| S | $^{2}$| Φ | 2 can be considered as a mass term. Therefore radiative corrections do not exactly cancel out [62, 68], and provide a one-loop potential: V F 1 − $_{loop}$( S ) = κ $^{4}$N M 4 32 π 2 [ 2 ln s $^{2}$κ2 Λ 2 + ( z + 1) $^{2}$ln(1 + $_{z}$− $^{1}$) + ( z − 1) $^{2}$ln(1 − $_{z}$− $^{1}$) ] , (222) using the Coleman-Weinberg formula [360]. In this expression z = | S | 2 M 2 ≡ x 2 , (223) Λ represents a non-physical energy scale of renormalization and N denotes the dimension- ality 60 of the Higgs fields Φ and Φ. When discussing the predictions of the model and the dynamics at the end of inflation, it is important to keep in mind that the perturbative approach of Coleman and Weinberg breaks down when close to the inflection point at z ≃ 1. 3. CMB predictions and constraints The predictions of the model differ strongly from the original model, because the potential is concave down due to the radiative correction is the origin for the slope in the potential. For small coupling κ , the slow-roll conditions (for η ) are violated infinitely close to the 60 To be very precise, the value of N is less or equal to the dimensionality of Φ or Φ. This factor should count the number of degrees of freedom in Φ that are light enough to be affected by the value of S . This can depend on the precise mass spectrum of the gauge group, for instance a specific GUT model. See discussion in [73]. 101