scholarly journals A Gamma-Ray Burst/Pulsar for Cosmic Ray Positrons with a Dark Matter-Like Spectrum

2010 ◽  
Vol 123 (4) ◽  
pp. 743-755 ◽  
Author(s):  
K. Ioka
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Gamma Ray Burst

scholarly journals Astroparticle Physics with H.E.S.S.: recents results and nearfuture prospects

2019 ◽  
Vol 209 ◽  
pp. 01054
Author(s):  
Emmanuel Moulin
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Lorentz Invariance ◽  
Cosmic Ray ◽  
High Energy ◽  
New Physics ◽  
Galactic Centre ◽  
Astroparticle Physics ◽  
Dark Matter Search ◽  
Physics Program

H.E.S.S. is an array of five Imaging Atmospheric Cherenkov Telescopes located in Namibia. It is designed for observations of astrophysical sources emitting very-high-energy (VHE) gamma rays in the energy range from a few ten GeVs to several ten TeVs. The H.E.S.S. instrument consists of four identical 12 m diameter telescopes and a 28 m diameter telescope placed at the center of the array. An ambitious Astroparticle Physics program is being carried out by the H.E.S.S. collaboration searching for New Physics in the VHE gamma-ray sky. The program includes the search for WIMP dark matter and axion-like particles, tests of Lorentz invariance, cosmic-ray electron measurements, and search for intergalactic magnetic fields. I will present the latest results on dark matter search from the observations of the Galactic Centre region, the search for Lorentz invariance violation with the 2014 flare observation of Markarian 501, and the first measurement of the cosmic-ray electron spectrum up to 20 TeV. The future of the H.E.S.S. Astroparticle Physics program will be discussed.

scholarly journals Decoupled sectors and Wolf–Rayet galaxies

2016 ◽  
Vol 25 (10) ◽  
pp. 1650094 ◽  
Author(s):  
Willy Fischler ◽  
Jimmy ◽  
Dustin Lorshbough
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Particle Mass ◽  
Gamma Ray Burst ◽  
Star Forming ◽  
Star Forming Regions ◽  
Visible Matter ◽  
Input Parameters ◽  
Jet Power ◽  
Matter Sector

It has recently been proposed that gamma-ray burst (GRB) events may be modified by the presence of a dark matter sector subcomponent that is charged under an unbroken U(1). This proposal depends upon there being a nontrivial density of charged dark matter in star forming regions of galaxies which host GRBs. We discuss four Wolf–Rayet galaxies (NGC 1614, NGC 3367, NGC 4216 and NGC 5430) which should contain comparable amounts of dark matter gas and visible matter gas in the star forming regions. We show that the ratio of dark jet power to visible jet power depends only on the ratio of particle mass and charge when the densities are equal, allowing for these input parameters to be probed directly by future observations of GRBs.

scholarly journals Diffuse gamma-ray background and cosmic-ray positrons from annihilating dark matter

2009 ◽  
Vol 80 (2) ◽  
Author(s):  
Masahiro Kawasaki ◽  
Kazunori Kohri ◽  
Kazunori Nakayama
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Cosmic Ray

scholarly journals Contribution of Dark Matter Annihilation to Gamma-Ray Burst Afterglows near Massive Galaxy Centers

2020 ◽  
Vol 904 (1) ◽  
pp. 17
Author(s):  
Bao-Quan Huang ◽  
Tong Liu ◽  
Feng Huang ◽  
Da-Bin Lin ◽  
Bing Zhang
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Dark Matter Annihilation ◽  
Gamma Ray Burst ◽  
Massive Galaxy

scholarly journals Indirect searches for dark matter with the Fermi LAT instrument

2014 ◽  
Vol 29 (22) ◽  
pp. 1430030 ◽  
Author(s):  
M. N. Mazziotta ◽  
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Weakly Interacting Massive Particles ◽  
Current Status ◽  
Large Area ◽  
Weakly Interacting ◽  
Electron Positron ◽  
Massive Particles ◽  
Particle Dark Matter

In this review the current status of several searches for particle dark matter with the Fermi Large Area Telescope instrument is presented. In particular, the current limits on the weakly interacting massive particles, obtained from the analyses of gamma-ray and cosmic ray electron/positron data, will be illustrated.

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