Light wino dark matter in brane world cosmology

Abstract

The thermal relic density of the wino-like neutralino dark matter in the brane world cosmology is studied. The expansion law at a high energy regime in the brane world cosmology is modified from the one in the standard cosmology, and the resultant relic density can be enhanced if the five dimensional Planck mass $M_5$ is low enough. We calculate the wino-like neutralino relic density in the anomaly mediated supersymmetry breaking scenario and show that the allowed region is dramatically modified from the one in the standard cosmology and the wino-like neutralino with mass of order 100 GeV can be a good candidate for the dark matter. Since the allowed region disappears eventually as $M_5$ is decreasing, we can find a lower bound on $M_5\gtrsim 100$ TeV according to the neutralino dark matter hypothesis, namely the lower bound in order for the allowed region of the neutralino dark matter to exist.

16 pages, 9 figures, final version

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• Cold dark matter in brane cosmology scenario
• Looking for a heavy wino LSP in collider and dark matter experiments
• Dark matter relic density in Gauss-Bonnet braneworld cosmology
• Asymmetric dark matter in braneworld cosmology
• Gauss-Bonnet braneworld cosmological effect on relic density of dark matter
• Gravitino dark matter from increased thermal relic particles
• Simple inflationary models in Gauss-Bonnet brane-world cosmology
• Simple brane-world inflationary models in light of BICEP2
• Simple brane-world inflationary models: an update
• Dark Matter Annihilation and the PAMELA, FERMI and ATIC Anomalies