Reference : The DAMPE excess and gamma-ray constraints
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Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
The DAMPE excess and gamma-ray constraints
Laletin, Maxim mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Inter. fondamentales en physique et astrophysique (IFPA) >]
Belotsky, Konstantin [National Research Nuclear University MEPhI > Deopartment of Elementary Particle Physics > > >]
Solovyov, Maxim [National Research Nuclear University MEPhI > Department of Elementary Particle Physics > > >]
Kamaletdinov, Airat [National Research Nuclear University MEPhI > Department of Elementary Particle Physics > > >]
[en] dark matter ; DAMPE ; cosmic rays
[en] The direct measurements of the cosmic electron-positron spectrum around 1 TeV made by DAMPE have induced many theoretical speculations about possible excesses in the data above the standard astrophysical predictions that might have the dark matter (DM) origin. These attempts mainly fall into two categories: i) DM annihilation (or decay) in the Galactic halo producing the broad spectrum excess; ii) DM annihilation in the nearby compact subhalo producing the sharp peak at 1.4 TeV. We investigate the gamma-ray emission accompanying e+e− production in DM annihilation, as well as various theoretical means to suppress the prompt radiation, such as specific interaction vertices or multi-cascade modes, and conclude that these attempts are in tension with various gamma-ray observations. We show that the DM explanations of the broad spectrum excess tend to contradict the diffuse isotropic gamma-ray background (IGRB), measured by Fermi-LAT, while the nearby subhalo scenario is constrained by nonobservation in the surveys, performed by Fermi-LAT, MAGIC and HESS. We also briefly review other types of gamma-ray constraints, which seem to rule out the DM interpretations of the DAMPE broad spectrum excess as well.
Space sciences, Technologies and Astrophysics Research - STAR
Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
Researchers ; Professionals
Submitted to Physics of the Dark Universe

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