Constraints on ultracompact minihalos from extragalactic γ-ray background

Details Constraints on ultracompact minihalos from extragalactic γ-ray background Constraints on ultracompact minihalos from extragalactic γ-ray background

2011-12-29

arxiv.org/abs/1112.6229v1

JCAP12(2011)020

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

13 pages, 4 figures, 1 table

Scientific paper

10.1088/1475-7516/2011/12/020

It has been proposed that ultracompact minihalos (UCMHs) might be formed in earlier epoch. If dark matter consists of Weakly Interacting Massive Particles (WIMPs), UCMHs can be treated as the {\gamma}-ray sources due to dark matter annihilation within them. In this paper, we investigate the contributions of UCMHs formed during three phase transi- tions (i.e., electroweak symmetry breaking, QCD confinement and e+ e- annihilation) to the extragalactic {\gamma}-ray background. Moreover, we use the Fermi-LAT observation data of the extragalactic {\gamma}-ray background to get the constraints on the current abundance of UCMHs produced during these phase transitions. We also compare these results with those obtained from Cosmic Microwave Background (CMB) observations and find that the constraints from the Fermi-LAT are more stringent than those from CMB

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