Leptogenesis, Gravitino Dark Matter and Entropy Production

Abstract

Many extensions of the Standard Model predict super-weakly interacting particles, which typically have to decay before Big Bang Nucleosynthesis (BBN). The entropy produced in the decays may help to reconcile thermal leptogenesis and BBN in scenarios with gravitino dark matter, which is usually difficult due to late decays of the next-to-lightest supersymmetric particle (NLSP) spoiling the predictions of BBN. We study this possibility for a general neutralino NLSP. We elaborate general properties of the scenario and strong constraints on the entropy-producing particle. As an example, we consider the saxion from the axion multiplet and show that, while enabling a solution of the strong CP problem, it can also produce a suitable amount of entropy.

28 pages, 3 figures; v2: references updated, changes in presentation including some generalization, results and conclusions unchanged; v3: 1 reference added, matches published version

References in corpus (19)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Leptogenesis
• Big-Bang Nucleosynthesis and Gravitino
• Big Bang Nucleosynthesis Constraints on Hadronically and Electromagnetically Decaying Relic Neutral Particles
• Neutralino with the Right Cold Dark Matter Abundance in (Almost) Any Supersymmetric Model
• Constraints on the Reheating Temperature in Gravitino Dark Matter Scenarios
• The effect of a late decaying scalar on the neutralino relic density
• Neutralino dark matter from heavy axino decay
• Cosmological implications of supersymmetric axion models
• Gravitino Dark Matter and general neutralino NLSP
• The number density of a charged relic
• Cosmological Constraints on Gravitino LSP Scenario with Sneutrino NLSP
• Non-thermal Production of Dark Matter from Late-Decaying Scalar Field at Intermediate Scale
• Collider signatures of gravitino dark matter with a sneutrino NLSP
• Dark Matter from Gaugino Mediation
• Sneutrino NLSP Scenarios in the NUHM with Gravitino Dark Matter
• Eluding the BBN constraints on the stable gravitino
• Effect of Long-lived Strongly Interacting Relic Particles on Big Bang Nucleosynthesis
• Entropy production by Q-ball decay for diluting long-lived charged particles

Cited by in corpus (2)

• Superconformal Symmetry, NMSSM, and Inflation
• Reconciling thermal leptogenesis with the gravitino problem in SUSY models with mixed axion/axino dark matter