New Constraints on Primordial Minihalo Abundance Using Cosmic Microwave Background Observations

Abstract

It was proposed that the massive compact halo objects (MCHOs) would be produced during an earlier epoch of cosmology if the density perturbations are between $3\times 10^{-4}$ and 0.3. Then these objects can accrete dark matter particles onto them due to their high density. If the dark matter is in the form of the weakly interacting massive particles, the MCHOs can have a significant effect on the evolution of cosmology due to the dark matter annihilation within them. Using the WMAP-7 years data, we investigated the constraints on the current abundance of MCHOs ($f_{MCHOs}$) formed during the $e^{+}{e}^{-}$ annihilation phase transition. We have found that the $2\sigma$ constraint is $f_{MCHOs}\lesssim 10^{-4}$ for dark matter masses in the range between 1 GeV and 1 TeV.

4 pages, 3 figures. An error has been corrected. Some references are added following the suggestion of Pat Scott. The final results are not changed

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• Observation of an anomalous positron abundance in the cosmic radiation
• New results from DAMA/LIBRA
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• 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

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