scholarly journals The observability of gamma-ray spectral features from Kaluza-Klein dark matter annihilation

2016 ◽  
Author(s):  
Satoshi Tsuchida ◽  
Masaki Mori
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Spectral Features ◽  
Dark Matter Annihilation ◽  
Kaluza Klein

scholarly journals The gamma-ray spectral feature from Kaluza–Klein dark matter annihilation and its observability

2017 ◽  
Vol 27 (01) ◽  
pp. 1750187 ◽  
Author(s):  
Satoshi Tsuchida ◽  
Masaki Mori
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Galactic Halo ◽  
Spectral Feature ◽  
High Energy ◽  
Dark Matter Annihilation ◽  
Peak Structure ◽  
Boost Factor ◽  
Near Future ◽  
Kaluza Klein

The theory of universal extra dimensions involves Kaluza–Klein (KK) particles. The lightest KK particle (LKP) is one of the good candidates for cold dark matter. Annihilation of LKP dark matter in the Galactic halo produces high-energy gamma-rays. The gamma-ray spectrum shows a characteristic peak structure around the LKP mass. This paper investigates the observability of this peak structure by near-future detectors taking account of their energy resolution and calculates the expected energy spectrum of the gamma-ray signal. Then, by using the High-Energy Stereoscopic System (HESS) data, we set some constraints on the boost factor, which is a product of the annihilation cross-section relative to the thermal one and an uncertain factor dependent on the substructure of the LKP distribution in the Galactic halo, for each LKP mass. The resulting upper limit on the boost factor is in the range from 1 to 30. The constraints can be regarded as comparable with the results of previous work for gamma-ray and electron–positron observation. However, the observational data for the TeV or higher energy region are still limited, and the possible LKP signal is not conclusive. Thus, we expect near-future missions with better sensitivity will clarify whether the LKP dark matter should exist or not.

scholarly journals Dark matter annihilation or unresolved astrophysical sources? Anisotropy probe of the origin of the cosmic gamma-ray background

2007 ◽  
Vol 75 (6) ◽  
Author(s):  
Shin’ichiro Ando ◽  
Eiichiro Komatsu ◽  
Takuro Narumoto ◽  
Tomonori Totani
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Dark Matter Annihilation
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