1992/07/07 by J. Lopez, Jorge L. Lopez, D. V. Nanopoulos +2 · 8 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1016/0370-2693(92)91041-7
published as Phys.Lett.B291:255-262,1992 · 12 pages plus 3 figures (not included); CERN-TH.6554/92, CTP-TAMU-49/92
arxiv created 1992/07/07 · openalex publication_date 1992/09/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We show that within the framework of the minimal SU(5) supergravity model, radiatively-induced electroweak symmetry breaking and presently available experimental lower bounds on nucleon decay, impose severe constraints on the available parameter space of the model which correspond to fine-tuning of the model parameters of over two orders of magnitude. Furthermore, a straightforward calculation of the cosmic relic density of neutralinos (χ) gives Ωχh2≫1 for most of the allowed parameter space in this model, although small regions may still be cosmologically acceptable. We finally discuss how the \it no-scale flipped SU(5) supergravity model avoids naturally the above troubles and thus constitutes a good candidate for the low-energy effective supergravity model.