Supersymmetric inflation and baryogenesis via extra-flat directions of the minimal supersymmetric standard model
- Cosmology and Astroparticle Physics Group, University of Lancaster, Lancaster LA1 4YB (United Kingdom)
- Instituto de Fisica Teorica UAM/CSIC, Universidad Autonoma de Madrid, Cantoblanco, Madrid 28049 (Spain)
One interpretation of proton stability is that it implies the existence of extra-flat directions of the minimal supersymmetric standard model, in particular u{sup c}u{sup c}d{sup c}e{sup c} and QQQL, where the operators lifting the potential are suppressed by a mass scale {Lambda} which is much larger than the Planck mass, {Lambda} Greater-Than-Or-Equivalent-To 10{sup 26} GeV. Using D-term hybrid inflation as an example, we show that such flat directions can serve as the inflaton in supersymmetric inflation models. The resulting model is a minimal version of D-term inflation which requires the smallest number of additional fields. In the case where Q-balls form from the extra-flat direction condensate after inflation, successful Affleck-Dine baryogenesis is possible if the suppression mass scale is Greater-Than-Or-Equivalent-To 10{sup 31}-10{sup 35} GeV. In this case the reheating temperature from Q-ball decay is in the range 3-100 GeV, while observable baryon isocurvature perturbations and non-thermal dark matter are possible. In the case of extra-flat directions with a large t squark component, there is no Q-ball formation and reheating is via conventional condensate decay. In this case the reheating temperature is in the range 1-100 TeV, naturally evading thermal gravitino overproduction while allowing sphaleron erasure of any large B-L asymmetry.
- OSTI ID:
- 22156685
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2008, Issue 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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