Doddato, Francesca and McDonald, John (2012) New Q-ball Solutions in Gauge-Mediation, Affleck-Dine Baryogenesis and Gravitino Dark Matter. Journal of Cosmology and Astroparticle Physics, 12 (6). ISSN 1475-7516
Full text not available from this repository.Abstract
Affleck-Dine (AD) baryogenesis along a d=6 flat direction in gauge-mediated supersymmetry-breaking (GMSB) models can produce unstable Q-balls which naturally have field strength similar to the messenger scale. In this case a new kind of Q-ball is formed, intermediate between gravity-mediated and gauge-mediated type. We study in detail these new Q-ball solutions, showing how their properties interpolate between standard gravity-mediated and gauge-mediated Q-balls as the AD field becomes larger than the messenger scale. It is shown that E/Q for the Q-balls can be greater than the nucleon mass but less than the MSSM-LSP mass, leading to Q-ball decay directly to Standard Model fermions with no MSSM-LSP production. More significantly, if E/Q is greater than the MSSM-LSP mass, decaying Q-balls can provide a natural source of non-thermal MSSM-LSPs, which can subsequently decay to gravitino dark matter without violating nucleosynthesis constraints. The model therefore provides a minimal scenario for baryogenesis and gravitino dark matter in the gauge-mediated MSSM, requiring no new fields.
| Item Type: | Article |
|---|---|
| Journal or Publication Title: | Journal of Cosmology and Astroparticle Physics |
| Additional Information: | 12 pages, 9 figures, additional references |
| Subjects: | Q Science > QC Physics |
| Departments: | Faculty of Science and Technology > Physics |
| ID Code: | 56814 |
| Deposited By: | ep_importer_pure |
| Deposited On: | 10 Aug 2012 18:07 |
| Refereed?: | Yes |
| Published?: | Published |
| Last Modified: | 10 Aug 2012 18:07 |
| Identification Number: | |
| URI: | http://eprints.lancs.ac.uk/id/eprint/56814 |
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