scholarly journals Kaluza-Klein Dark Matter, Electrons and Gamma Ray Telescopes

2004 ◽  
Author(s):  
E Baltz
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Gamma Ray Telescopes ◽  
Kaluza Klein

scholarly journals Resolving dark matter subhalos with future sub-GeV gamma-ray telescopes

2018 ◽  
Vol 21 ◽  
pp. 1-7 ◽  
Author(s):  
Ti-Lin Chou ◽  
Dimitrios Tanoglidis ◽  
Dan Hooper
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Gamma Ray Telescopes

scholarly journals From diffuse extragalactic and galactic gamma-rays to limits on extra dimensions

2019 ◽  
Vol 492 (1) ◽  
pp. L66-L68
Author(s):  
Michel Cassé ◽  
Bruno Mansoulié ◽  
Joseph Silk
Keyword(s):  
Dark Matter ◽  
Gamma Rays ◽  
Extra Dimensions ◽  
Gamma Ray ◽  
Core Collapse ◽  
Planck Mass ◽  
Galactic Emission ◽  
Lower Limits ◽  
Kaluza Klein

ABSTRACT We derive the maximum fraction of energy emitted in the form of massive (Kaluza–Klein) gravitons by core collapse supernovae, and the corresponding minimal extra-dimensional Planck mass M* in the ADD gravity framework at TeV scales. Our constraints arise (a) from the extragalactic gamma-ray background observed by Fermi-LAT after astrophysical sources have been removed and (b) via the residual galactic emission left after astrophysical and potentially dark matter emission have been removed. We focus on a number of extra dimensions 3 and 4, since M* is then in the TeV range, where astrophysical and collider constraints compete. Lower limits on M* are derived in the case (a) of 8.0 and 1.1 TeV for n = 3 and n = 4, respectively, and in the case (b) of 16 and 1.9 TeV. These limits are especially robust and insensitive to the various uncertainties involved.

scholarly journals Gamma-ray signatures for Kaluza-Klein dark matter

2006 ◽  
Author(s):  
Lars Bergström ◽  
Torsten Bringmann ◽  
Michael Gustafsson ◽  
Martin Eriksson
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
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 Decaying dark matter in dwarf spheroidal galaxies: Prospects for x-ray and gamma-ray telescopes

2021 ◽  
Vol 104 (2) ◽  
Author(s):  
Shin’ichiro Ando ◽  
Suvendu K. Barik ◽  
Zhuoran Feng ◽  
Marco Finetti ◽  
Andreas Guerra Chaves ◽  
...  
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
X Ray ◽  
Dwarf Spheroidal Galaxies ◽  
Decaying Dark Matter ◽  
Gamma Ray Telescopes ◽  
Spheroidal Galaxies
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