Entropy considerations in constraining the mSUGRA parameter space
- Instituto de Ciencias Nucleares, Departamento de Gravitacion y Teoria de Campos, Universidad Nacional Autonoma de Mexico (ICN-UNAM). A. Postal 70-543, 04510 Mexico, D.F. (Mexico)
- Departamento de Postgrado, Centro Interdisciplinario de Investigacion y Docencia en Educacion Tecnica (CIIDET), Av. Universidad 282 Pte., Col. Centro, A. Postal 752, C. P. 76000, Santiago de Queretaro, Qro. (Mexico)
- Instituto de Fisica, Universidad Nacional Autonoma de Mexico (IF-UNAM). A. Postal 20-364, 01000 Mexico D.F. (Mexico)
We explore the use of two criteria to constraint the allowed parameter space in mSUGRA models. Both criteria are based in the calculation of the present density of neutralinos as dark matter in the Universe. The first one is the usual ''abundance'' criterion which is used to calculate the relic density after the ''freeze-out'' era. To compute the relic density we used the numerical public code micrOMEGAs. The second criterion applies the microcanonical definition of entropy to a weakly interacting and self-gravitating gas evaluating then the change in the entropy per particle of this gas between the ''freeze-out'' era and present day virialized structures (i.e systems in virial equilibrium). An ''entropy-consistency'' criterion emerges by comparing theoretical and empirical estimates of this entropy. The main objective of our work is to determine for which regions of the parameter space in the mSUGRA model are both criteria consistent with the 2{sigma} bounds according to WMAP for the relic density: 0.0945 < {omega}CDMh2 < 0.1287. As a first result, we found that for A0 = 0, sgn{mu} +, small values of tan{beta} are not favored; only for tan{beta} {approx_equal} 50 are both criteria significantly consistent.
- OSTI ID:
- 20888249
- Journal Information:
- AIP Conference Proceedings, Vol. 857, Issue 1; Conference: 10. Mexican workshop on particles and fields, Morelia, Michoacan (Mexico), 6-12 Nov 2005; Other Information: DOI: 10.1063/1.2359276; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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