Probing the inert doublet dark matter model with Cherenkov telescopes

Garcia-Cely, Camilo (Service de Physique Théorique, CP225, Université Libre de Bruxelles, Bld du Triomphe, Brussels, 1050 Belgium) ; Gustafsson, Michael (Institute for theoretical Physics—Faculty of Physics, Georg-August University Göttingen, Friedrich-Hund-Platz 1, Göttingen, D-37077 Germany) ; Ibarra, Alejandro (Physik-Department T30d, Technische Universität München, James-Franck-Straße, Garching, D-85748 Germany)

17 February 2016

Abstract: We present a detailed study of the annihilation signals of the inert dark matter doublet model in its high mass regime. Concretely, we study the prospects to observe gamma-ray signals of the model in current and projected Cherenkov telescopes taking into account the Sommerfeld effect and including the contribution to the spectrum from gamma-ray lines as well as from internal bremsstrahlung. We show that present observations of the galactic center by the H.E.S.S. instrument are able to exclude regions of the parameter space that give the correct dark matter relic abundance. In particular, models with the charged and the neutral components of the inert doublet nearly degenerate in mass have strong gamma-ray signals. Furthermore, for dark matter particle masses above 1 TeV, we find that the non-observation of the continuum of photons generated by the hadronization of the annihilation products typically give stronger constraints on the model parameters than the sharp spectral features associated to annihilation into monochromatic photons and the internal bremsstrahlung process. Lastly, we also analyze the interplay between indirect and direct detection searches for this model, concluding that the prospects for the former are more promising. In particular, we find that the upcoming Cherenkov Telescope Array will be able to probe a significant part of the high mass regime of the model.

Published in: JCAP 1602 (2016) 043
Published by: Institute of Physics Publishing/SISSA
DOI: 10.1088/1475-7516/2016/02/043
arXiv: 1512.02801
License: CC-BY-3.0

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