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<img src='content_image/374784.jpg'>

Another symmetry - the Heisenberg symmetry - has also been invoked to protect the form of the K¨ ahler potential, see for a recent discussion in [635], generating a model where the effective K¨ ahler is a no-scale potential, that is of the form K = ln(Φ$_{i}$). This obviously solves the η -problem by canceling the exponential term exp( K ) $^{64}$. 

The presence of non-renormalizable correction to the kinetic terms has important conse- quences on the CMB predictions of the F -term hybrid model. In particular it can be used to realize a better agreement with the WMAP 5 measurement on the spectral index [72, 82]. It has been shown that the presence of the κ$_{s}$ term in Eq. (230) allow the model to; 

1) lower the value of M responsible for the normalization of the spectrum for a given κ and 

