Abstract
We discuss the emergence of an inflationary phase in supergravity with the super-Higgs effect due to dynamical spontaneous breaking of supersymmetry, in which the role of the inflaton is played by the gravitino condensate. Realistic models compatible with the Planck satellite CMB data are found in conformal supergravity scenarios with dynamical gravitino masses that are small compared to the Planck mass, as could be induced by a non-trivial vacuum expectation value of the dilaton superfield of appropriate magnitude.
Highlights
Inflation [1], especially the version with a scalar field rolling slowly towards a non-trivial global minimum of its potential [2, 3], is a successful framework for explaining general features of cosmology and notably the data on the Cosmic Microwave Background (CMB) from the WMAP [4] and Planck satellites [5]
In a recent work [11] we updated phenomenological studies of non-monomial inflationary potentials [6] within supersymmetry, showing that a toy flatspace supersymmetric Wess-Zumino model with a single chiral scalar superfield gives rise to an inflaton potential that is comfortably consistent with the Planck data
We have presented in this paper a new inflationary scenario in supergravity, in which the inflaton is identified with the gravitino condensate that forms dynamically and breaks local supersymmetry in a conformal supergravity model, with the complex scalar superfield√corresponding to the conformal factor containing dilaton and axion fields
Summary
Inflation [1], especially the version with a scalar field (inflaton) rolling slowly towards a non-trivial global minimum of its potential [2, 3], is a successful framework for explaining general features of cosmology and notably the data on the Cosmic Microwave Background (CMB) from the WMAP [4] and Planck satellites [5]. In the present work we pursue another avenue for producing inflation in supergravity models, which may be realized in models in which local supersymmetry is broken dynamically Such scenarios differ from those examined in [15] in that in our approach it is the gravitino condensate field that plays the role of the inflaton via its one-loop effective potential. Agreement with the Planck data [5] can be obtained for a suitable value of the cut-off relative to a transmutation mass scale This yields a minimal inflationary scenario in the simplest (conformal) supergravity model, which does not require knowledge of the Kahler potential, unlike other models in the literature.
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