Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-02
Phys.Rev. D68 (2003) 083518
Astronomy and Astrophysics
Astrophysics
7 pages, 7 figures, new cosmological constraints added, accepted for publication in PRD
Scientific paper
10.1103/PhysRevD.68.083518
We explore cosmological implications of dark matter as massive particles trapped on a brane embedded in a Randall-Sundrum noncompact higher dimension $AdS_5$ space. It is an unavoidable consequence of this cosmology that massive particles are metastable and can disappear into the bulk dimension. Here, we show that a massive dark matter particle (e.g. the lightest supersymmetric particle) is likely to have the shortest lifetime for disappearing into the bulk. We examine cosmological constraints on this new paradigm and show that disappearing dark matter is consistent (at the 95% confidence level) with all cosmological constraints, i.e. present observations of Type Ia supernovae at the highest redshift, trends in the mass-to-light ratios of galaxy clusters with redshift, the fraction of X-ray emitting gas in rich clusters, and the spectrum of power fluctuations in the cosmic microwave background. A best $2 \sigma$ concordance region is identified corresponding to a mean lifetime for dark matter disappearance of $15 \le \Gamma^{-1} \le 80$ Gyr. The implication of these results for brane-world physics is discussed.
Garnavich Peter M.
Ichiki Kiyotomo
Kajino Taka
Mathews Grant J.
Yahiro Masanobu
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