2005/09/30 by Takeshi Nihei, Nobuchika Okada, Osamu Seto · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevd.73.063518
published as Phys.Rev. D73 (2006) 063518 · 16 pages, 9 figures, final version
openalex publication_date 2006/03/17 · arxiv created 2006/04/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The thermal relic density of W-ino-like neutralino dark matter in brane world cosmology is studied. The expansion law at a high energy regime in brane world cosmology is modified from the one in standard cosmology, and the resultant relic density can be enhanced if the five-dimensional Planck mass M5 is low enough. We calculate the W-ino-like neutralino relic density in the anomaly mediated supersymmetry breaking scenario and show that the allowed region is dramatically modified from the one in standard cosmology and the W-ino-like neutralino with mass of order 100 GeV can be a good candidate for dark matter. Since the allowed region disappears eventually as M5 decreases, we can find a lower bound on M5\ensuremath\gtrsim100 TeV according to the neutralino dark matter hypothesis, namely, the lower bound in order for the allowed region of neutralino dark matter to exist.