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Title

The degenerate gravitino scenario

AuthorsVives, Óscar ; Ruiz de Austri, Roberto ; Boubekeur, Lotfi; Choi, Ki-Young
KeywordsDark matter theory
Leptogenesis
Supersymmetry and cosmology
Cosmology of theories beyond the SM
Issue Date7-Apr-2010
PublisherInstitute of Physics Publishing
CitationJournal of Cosmology and Astroparticle Physics (4): 005 (2010)
AbstractIn this work, we explore the "degenerate gravitino" scenario where the mass difference between the gravitino and the lightest MSSM particle is much smaller than the gravitino mass itself. In this case, the energy released in the decay of the next to lightest sypersymmetric particle (NLSP) is reduced. Consequently the cosmological and astrophysical constraints on the gravitino abundance, and hence on the reheating temperature, become softer than in the usual case. On the other hand, such small mass splittings generically imply a much longer lifetime for the NLSP. We find that, in the constrained MSSM (CMSSM), for neutralino LSP or NLSP, reheating temperatures compatible with thermal leptogenesis are reached for small splittings of order 10(-2) GeV. While for stau NLSP, temperatures of T-RH similar or equal to 4 x 10(9) GeV can be obtained even for splittings of order of tens of GeVs. This "degenerate gravitino" scenario offers a possible way out to the gravitino problem for thermal leptogenesis in supersymmetric theories.
Publisher version (URL)http://dx.doi.org/ 10.1088/1475-7516/2010/04/005
URIhttp://hdl.handle.net/10261/24871
DOI10.1088/1475-7516/2010/04/005
ISSN1475-7516
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