Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-09-22
Phys.Rev. D73 (2006) 063518
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 9 figures, final version
Scientific paper
10.1103/PhysRevD.73.063518
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.
Nihei Takeshi
Okada Nobuchika
Seto Osamu
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