Decaying Superheavy Dark Matter and Subgalactic Structure of the Universe

Abstract

The collisionless cold dark matter (CCDM) model predicts overly dense cores in dark matter halos and overly abundant subhalos. We show that the idea that CDM are decaying superheavy particles which produce ultra-high energy cosmic rays with energies beyond the Greisen-Zatsepin-Kuzmin cutoff may simultaneously solve the problem of subgalactic structure formation in CCDM model. In particular, the Kuzmin-Rubakov's decaying superheavy CDM model may give an explanation to the smallness of the cosmological constant and a new thought to the CDM experimental search.

5 pages, 1 figure. Add a new paragraph on the production of UHECR. References added. Final version which is to appear in Phys.Lett.B

References in corpus (6)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• Unstable Cold Dark Matter and the Cuspy Halo Problem in Dwarf Galaxies
• Ionization history of the cosmic plasma in the light of the recent CBI and future PLANCK data
• Recombining WMAP: constraints on ionizing and resonance radiation at recombination
• Full-Sky Search for Ultra High Energy Cosmic Ray Anisotropies
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• Superheavy Dark Matter and ANITA's Anomalous Events
• Holographic bounds and Higgs inflation
• Thermodynamics of Lemaitre-Tolman-Bondi Model
• Interacting Ricci Dark Energy and its Statefinder Description
• Ultra High Energy Cosmic Rays & Super-heavy Dark Matter
• Causality Problem in a Holographic Dark Energy Model
• Scalar-Tensor Theory of Gravity and Generalized Second Law of Thermodynamics on the Event Horizon
• On Internal Consistency of Holographic Dark Energy Models
• Cosmological Analysis of Modified Holographic Ricci Dark Energy in Chern-Simons Modified Gravity
• Holographic dark energy: quantum correlations against thermodynamical description
• Superheavy Supersymmetric Dark Matter for the origin of KM3NeT Ultra-High Energy signal
• On radiative np -> 1s + gamma transitions, induced by strong low-energy interactions,in kaonic atoms
• Effective field theory, large number of particle species, and holography
• Role of generalized Ricci dark energy on Chameleon field in the emergent universe
• A frequentist view on the two-body decaying dark matter model
• Entanglement in holographic dark energy models
• Avoiding Boltzmann Brain domination in holographic dark energy models