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G. J. Mathews, P. M. Garnavich (Center for Astrophysics at Notre Dame Univ.), K. Ichiki (NAOJ, Tokyo Univ.), T. Kajino (NAOJ), M. Yahiro (Ryukyus Univ.)
We explore cosmological implications of dark matter as massive particles trapped on a brane embedded in a large Randall-Sundrum noncompact higher dimensional AdS5 space. It is an unavoidable consequence of this currently popular 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 < t < 80 Gyr. The implication of these results for constraining brane-world physics is discussed.
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The author(s) of this abstract have provided an email address for comments about the abstract: gmathews@nd.edu
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.