The Abundance of New Kind of Dark Matter Structures

Abstract

A new kind of dark matter structures, ultracompact minihalos (UCMHs) was proposed recently. They would be formed during the radiation dominated epoch if the large density perturbations are existent. Moreover, if the dark matter is made up of weakly interacting massive particles, the UCMHs can have effect on cosmological evolution because of the high density and dark matter annihilation within them. In this paper, one new parameter is introduced to consider the contributions of UCMHs due to the dark matter annihilation to the evolution of cosmology, and we use the current and future CMB observations to obtain the constraint on the new parameter and then the abundance of UCMHs. The final results are applicable for a wider range of dark matter parameters

4 pages, 1 table

References in corpus (4)

• Pre-launch estimates for GLAST sensitivity to Dark Matter annihilation signals
• The impacts of dark matter particle annihilation on recombination and the anisotropies of the cosmic microwave background
• Gamma-rays from ultracompact minihalos: potential constraints on the primordial curvature perturbation
• New Constraints on Primordial Minihalo Abundance Using Cosmic Microwave Background Observations

Cited by in corpus (15)

• Probing the inflaton: Small-scale power spectrum constraints from measurements of the CMB energy spectrum
• Density profiles of ultracompact minihalos: Implications for constraining the primordial power spectrum
• Are ultracompact minihalos really ultracompact?
• A new probe of the small-scale primordial power spectrum: astrometric microlensing by ultracompact minihalos
• Small-scale clumps of dark matter
• Formation and internal structure of superdense dark matter clumps and ultracompact minihaloes
• Number Counts and Non-Gaussianity
• Ultracompact minihalos as probes of inflationary cosmology
• Constraints on ultracompact minihalos from extragalactic γ-ray background
• Neutrino signals from ultracompact minihalos and constraints on the primordial curvature perturbation
• The contribution of ultracompact dark matter minihalos to the isotropic radio background
• Dark Matter Decay and the Abundance of Ultracompact Minihalos
• Minihalos as probes of the inflationary spectrum: accurate boost factor calculation and new CMB constraints
• Constraints on the ultracompact minihalos using neutrino signals from the gravitino dark matter decay
• Cosmological abundance of primordial black holes in mixed dark matter scenarios incorporating Kaluza-Klein dark matter