Disappearing Dark Matter in Brane World Cosmology: New Limits on Noncompact Extra Dimensions

Abstract

We explore cosmological implications of dark matter as massive particles trapped on a brane embedded in a Randall-Sundrum noncompact higher dimension $Ad{S}_5$ 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.

7 pages, 7 figures, new cosmological constraints added, accepted for publication in PRD

References in corpus (9)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Cosmological Results from High-z Supernovae
• Wilkinson Microwave Anisotropy Probe (WMAP) First Year Observations: TE Polarization
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Angular Power Spectrum
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Tests of Gaussianity
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Parameter Estimation Methodology
• Constraining the cosmological parameters with the gas mass fraction in local and z>0.7 Galaxy Clusters
• Cosmology of a brane radiating gravitons into the extra dimension
• Generation of dark radiation in the bulk inflaton model

Cited by in corpus (20)

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• Gamma ray constraints on Decaying Dark Matter
• Big Bang Nucleosynthesis with a New Neutron Lifetime
• Model-Independent Bound on the Dark Matter Lifetime
• WMAP Constraints on Decaying Cold Dark Matter
• Annihilation vs. Decay: Constraining dark matter properties from a gamma-ray detection
• Global and Local Effects of Rotation: Observational Aspects
• Observational Constraints on Accelerating Brane Cosmology with Exchange between the Bulk and Brane
• Generation of Curvature Perturbations with Extra Anisotropic Stress
• Local conservation law and dark radiation in cosmological braneworld
• Dynamics of massive matter disappearance on the brane
• Reheating the Universe in Braneworld Cosmological Models with bulk-brane energy transfer
• Testing and selection of cosmological models with $(1+z{)}^6$ corrections
• Towards observational constraints on negative (1+z)^4 type contribution in the Friedmann equation
• Sunyaev-Zel'dovich power spectrum with decaying cold dark matter
• A solution of the coincidence problem based on the recent galactic core black hole mass density increase
• The nature of cosmological singularities in isotropic universes and braneworlds
• LHC signatures of vector boson emission from brane to bulk
• Constraining bouncing cosmology caused by Casimir effect
• Testing the effects from dark radiation