标题： 利用宇宙微波背景观测对原初微弱星系团丰度的新限制 显示英文标题

标题： New Constraints on Primordial Minihalo Abundance Using Cosmic Microwave Background Observations

摘要： 如果密度扰动介于$3 \times 10^{-4}$和 0.3 之间，那么大质量致密晕天体（MCHOs）会在宇宙学的早期时期产生。 然后由于它们的高密度，这些天体会吸积暗物质粒子。 如果暗物质是以弱相互作用大质量粒子的形式存在，由于它们内部的暗物质湮灭，MCHOs 可以对宇宙学演化产生显著影响。 利用 WMAP-7 年的数据，我们研究了在$e^{+} e^{-}$湮灭相变期间形成的 MCHOs（$f_{MCHOs}$）当前丰度的约束。 我们发现，在 1 GeV 到 1 TeV 的暗物质质量范围内，$2\sigma$的约束为$f_{MCHOs} \lesssim 10^{-4}$。 显示英文摘要

摘要： 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.