Axinos as Dark Matter Particles

Abstract

The identification of dark matter in our particle physics model is still a very open question. Here we will argue that axinos can be successful dark matter candidates in models with supersymmetry and the axion solution of the strong CP problem. Axinos can be the lightest supersymmetric particle (LSP), or can be heavier than the LSP. Axinos can be produced in the right abundance by thermal scatterings and if they are the LSP also by out of equilibrium decays of the lightest superpartner of SM fields (LSPSMs). On the other hand heavier (not LSP) axinos can generate a part of the neutralino LSP dark matter. Depending on the nature of the supersymmetric spectrum, and if R-parity is strictly conserved or slightly broken, very different signals of the LSP axino scenario can arise at colliders and in astrophysics.

15 pages, 2 figures, invited contribution to NJP Focus Issue on 'Dark Matter and Particle Physics'

References in corpus (16)

• Observation of an anomalous positron abundance in the cosmic radiation
• A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation
• Update of axion CDM energy density
• High-energy electron observations by PPB-BETS flight in Antarctica
• Neutralino dark matter from heavy axino decay
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• Thermal inflation, baryogenesis and axions
• Determining Reheating Temperature at Colliders with Axino or Gravitino Dark Matter
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• Solving Cosmological Problems of Supersymmetric Axion Models in an Inflationary Universe
• The Hierarchy Problem and the Self-Localized Higgs
• Cascading to the MSSM
• Flaxino dark matter and stau decay
• Bounds on Light Dark Matter

Cited by in corpus (2)

• Mainly axion cold dark matter in the minimal supergravity model
• PAMELA/ATIC Anomaly from Exotic Mediated Dark Matter Decay