ar X iv : h ep - p h / 03 10 19 4 v 2 1 0 N ov 2 00 3 Inflation without Flat Directions
نویسنده
چکیده
We investigate the possibility that the Universe may inflate due to moduli fields, corresponding to flat directions of supersymmetry, lifted by supergravity corrections. Using a hybrid-type potential we obtain a two-stage inflationary model. Depending on the curvature of the potential the first stage corresponds to a period of fast-roll inflation or a period of ‘locked’ inflation, induced by an oscillating inflaton. This may well be followed by a second stage of fast-roll inflation. We demonstrate that these two consecutive inflationary phases result in enough total e-foldings to encompass the cosmological scales. Using natural values for the parameters (masses of order TeV and vacuum energy of the intermediate scale corresponding to gravity mediated supersymmetry breaking) we conclude that the η-problem of inflation is easily overcome. To generate structure in the Universe we assume the presence of a curvaton field. Finally we also discuss the moduli problem and how it affects our considerations.
منابع مشابه
ar X iv : h ep - p h / 03 10 19 4 v 1 1 6 O ct 2 00 3 Inflation without Flat Directions
We investigate the possibility that the Universe may inflate due to moduli fields, corresponding to flat directions of supersymmetry, lifted by supergravity corrections. We show that a period of ‘locked’ inflation, induced by an oscillating inflaton, may well be followed by a stage of fast-roll inflation. We demonstrate that these two consecutive inflationary phases result in enough total e-fol...
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