Year: 2015
Type: article
Abstract: Dark matter (DM) annihilation or decay can affect the anisotropy of the cosmic microwave background (CMB). Therefore, the CMB data can be used to constrain the properties of a dark matter particle. In this work, we use the new CMB data obtained by the Planck satellite to investigate the limits on the basic parameters of a dark matter particle. The parameters are the dark matter mass (${m}_{\ensuremath{\chi}}$) and the thermally averaged cross section ($⟨\ensuremath{\sigma}v⟩$) for dark matter annihilation and the decay rate ($\mathrm{\ensuremath{\Gamma}}$) (or lifetime $\ensuremath{\tau}=1/\mathrm{\ensuremath{\Gamma}}$) for dark matter decay. For dark matter annihilation, we also consider the impact of the structure formation process which is neglected by the recent work. We find that for DM annihilation, the constraints on the parameters are ${f}_{ann}=⟨\ensuremath{\sigma}v⟩/{m}_{\ensuremath{\chi}}<0.16\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}26}\text{ }\text{ }{\mathrm{cm}}^{3}\text{ }{\mathrm{s}}^{\ensuremath{-}1}\text{ }{\mathrm{GeV}}^{\ensuremath{-}1}$(or ${f}_{ann}<0.89\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}6}\text{ }\text{ }{\mathrm{m}}^{3}\text{ }{\mathrm{s}}^{\ensuremath{-}1}\text{ }{\mathrm{kg}}^{\ensuremath{-}1}$, 95% C.L.). For DM decay, the constraints on the decay rate are $\mathrm{\ensuremath{\Gamma}}<0.28\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}25}\text{ }\text{ }{\mathrm{s}}^{\ensuremath{-}1}$(95% C.L.).
Author: Yupeng Yang
Institution: Anyang Normal University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: National Science Foundation
Awards: G1182499173, G125864198, G4041404569
OpenAlex ID: W1969302213