Gravitino dark matter and the lithium primordial abundance within a pre-BBN modified expansion

Journal Article · Tue Mar 01 04:00:00 EST 2011 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2011/03/022· OSTI ID:22275496

Bailly, Sean ^[1]

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1. Laboratoire de Physique Théorique LAPTH, Université de Savoie, CNRS (UMR 5108), BP 110, F-74941 Annecy-Le-Vieux Cedex (France)

We present supersymmetric scenarios with gravitino LSP and stau NLSP in the case of a non-standard model of cosmology with the addition of a dark component in the pre-BBN era. In the context of the standard model of cosmology, gravitino LSP has drawn quite some attention as it is a good candidate for dark matter. It is produced in scattering processes during reheating after inflation and from the decay of the stau. With a long lifetime, the stau decays during Big Bang Nucleosynthesis. It is strongly constrained by the abundance of light elements but can however address the known ''BBN lithium problem''. It requires fairly massive staus m{sub τ-tilde}∼> 1TeV and puts an upper bound on the reheating temperature T{sub R} ≅ 10{sup 7} GeV which does not satisfy the requirements for thermal leptogenesis. For the non-standard cosmological scenario, the reheating temperature bound can be strongly relaxed T{sub R} >> 10{sup 9}GeV and the lithium-7 problem solved with a stau typical mass of m{sub τ-tilde} ∼ 600–700 GeV and down to ∼ 400GeV with a very important dark component that could enable possible production and detection at the LHC.

• OSTI ID: 22275496
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 03 Vol. 2011; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMOLOGY
ELEMENT ABUNDANCE
GEV RANGE
INFLATIONARY UNIVERSE
LIFETIME
LITHIUM
LITHIUM 7
NONLUMINOUS MATTER
NUCLEOSYNTHESIS
PARTICLE PRODUCTION
SPARTICLES
STANDARD MODEL
SUPERSYMMETRY
VISIBLE RADIATION