scholarly journals Cosmic ray-dark matter scattering: a new signature of (asymmetric) dark matter in the gamma ray sky

2011 ◽  
Vol 2011 (08) ◽  
pp. 020-020 ◽  
Author(s):  
Stefano Profumo ◽  
Lorenzo Ubaldi
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Asymmetric Dark Matter ◽  
Dark Matter Scattering

scholarly journals Gamma ray constraints on flavor violating asymmetric dark matter

2012 ◽  
Vol 2012 (12) ◽  
pp. 002-002 ◽  
Author(s):  
Isabella Masina ◽  
Paolo Panci ◽  
Francesco Sannino
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Asymmetric Dark Matter

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 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 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.

scholarly journals Cosmic Gamma Ray Constraints on the Indirect Effects of Dark Matter

Particles ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 336-344 ◽  
Author(s):  
Konstantin M. Belotsky ◽  
Airat Kh. Kamaletdinov ◽  
Ekaterina S. Shlepkina ◽  
Maxim L. Solovyov
Keyword(s):  
Dark Matter ◽  
Gamma Radiation ◽  
Indirect Effects ◽  
Gamma Ray ◽  
Indirect Evidence ◽  
Cosmic Ray ◽  
High Energy ◽  
Observational Constraint ◽  
Atom Model ◽  
Suppression Effects

The observed anomalous excess of high-energy cosmic ray (CR) positrons is widely discussed as possible indirect evidence for dark matter (DM). However, any source of cosmic positrons is inevitably the source of gamma radiation. The least model dependent test of CR anomalies interpretation via DM particles decays (or annihilation) is connected with gamma-ray background due to gamma overproduction in such processes. In this work, we impose an observational constraint on gamma ray production from DM. Then, we study the possible suppression of gamma yield in the DM decays into identical final fermions. Such DM particles arise in the multi-component dark atom model. The influence of the interaction vertices on the gamma suppression was also considered. No essential gamma suppression effects are found. However, some minor ones are revealed.

scholarly journals Gamma-ray triangles: A possible signature of asymmetric dark matter in indirect searches

2016 ◽  
Vol 94 (10) ◽  
Author(s):  
Alejandro Ibarra ◽  
Sergio Lopez-Gehler ◽  
Emiliano Molinaro ◽  
Miguel Pato
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Asymmetric Dark Matter

scholarly journals Polynomial spectrum of gamma ray from dark matter

2017 ◽  
Vol 32 (33) ◽  
pp. 1745001 ◽  
Author(s):  
Yong Tang
Keyword(s):  
Dark Matter ◽  
Power Law ◽  
Wide Class ◽  
Degrees Of Freedom ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Gamma Line ◽  
Polynomial Type ◽  
Model Independent ◽  
Positive Index

In this paper, we present some general features of gamma-ray spectra from dark matter (DM). We find that the spectrum with sharp features could appear in a wide class of DM models and mimic the gamma line signals. If all other physical degrees of freedom are heavy or effectively decoupled, the resulting gamma ray from DM decay or annihilation would generally have polynomial-type spectra or power-law with positive index. We illustrate our findings in a model-independent framework with generic kinematic analysis. Similar results can also apply for cosmic ray or neutrino cases.

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