Constraints on ultracompact minihalos from extragalactic {\gamma}-ray background - INSPIRE

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Constraints on ultracompact minihalos from extragalactic {\gamma}-ray background

Yu-Peng Yang
(
- Nanjing U. and
- Beijing Observ.
)
,
Lei Feng
(
- Nanjing U.
)
,
Xiao-Yuan Huang
(
- Beijing Observ.
)
,
Xuelei Chen
(
- Beijing Observ.
)
,
Tan Lu
(
- Nanjing U. and
- Purple Mountain Observ.
)

Dec, 2011

13 pages

Published in:

JCAP 12 (2011) 020

e-Print:

1112.6229 [astro-ph.CO]

DOI:

10.1088/1475-7516/2011/12/020

View in:

ADS Abstract Service

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Abstract: (arXiv)

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

Note:

13 pages, 4 figures, 1 table

dark matter theory
gamma ray theory
cosmological parameters from CMBR
dark matter: annihilation
electroweak interaction: symmetry breaking
electron positron: annihilation
halo
cosmic background radiation
GLAST
WIMP

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