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Troubles with the minimal SU(5) supergravity model
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 o...
Autores principales: | , , |
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Lenguaje: | eng |
Publicado: |
1992
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/0370-2693(92)91041-7 http://cds.cern.ch/record/238906 |
Sumario: | 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 ($\chi$) gives $\Omega_\chi h^2\gg1$ 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. |
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