AAS 203rd Meeting, January 2004
Session 69 The High Z Universe
Oral, Tuesday, January 6, 2004, 2:00-3:30pm, Centennial IV

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[69.08] Disappearing Dark Matter in Brane World Cosmology: New Evidence from Supernovae, Galactic Clusters, and the cosmic Microwave Background

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.

If you would like more information about this abstract, please follow the link to http://xxx.lanl.gov/abs/astro-ph/0210052. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

The author(s) of this abstract have provided an email address for comments about the abstract: gmathews@nd.edu

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