Abstract
Weak-scale secluded sector dark matter can reproduce the observed dark matter relic density with thermal freeze-out within that sector. If nature is supersymmetric, three portals to the visible sector---a gauge portal, a Higgs portal, and a gaugino portal---are present. We present gamma ray spectra relevant for indirect detection of dark matter annihilation in such setups. Since symmetries in the secluded sector can stabilize dark matter, $R$-parity is unnecessary, and we investigate the impact of $R$-parity violation on annihilation spectra. We present limits from the Fermi Large Area Telescope observations of dwarf galaxies and projections for Cherenkov Telescope Array observations of the galactic center. Many of our results are also applicable to generic, nonsupersymmetric setups.
Highlights
The weakly interacting massive particle (WIMP) paradigm—wherein the relic density of the dark matter (DM) is explained by the thermal freeze-out of dark matter from the thermal bath via a weak scale annihilation cross section [1]—remains an attractive mechanism to explain the observed abundance of dark matter in the Universe
Whereas direct detection signals are suppressed by the portal couplings, dark matter annihilations proceed with weak scale cross sections, as this sets the thermal relic density
The prediction μij is the sum of the counts calculated from background models as well as the dark matter signal with some annihilation cross section hσvi
Summary
The weakly interacting massive particle (WIMP) paradigm—wherein the relic density of the dark matter (DM) is explained by the thermal freeze-out of dark matter from the thermal bath via a weak scale annihilation cross section [1]—remains an attractive mechanism to explain the observed abundance of dark matter in the Universe. The gaugino portal can have implications for dark matter phenomenology [9], collider physics, and cosmology [11,12], as well as models of baryogenesis [13] The existence of such portal interactions can lead to novel spectra of final states relevant for indirect detection; this will be the focus of this paper. With secluded dark matter, additional particles and symmetries in the secluded sector may provide a stable dark matter candidate, and the possibility that the LSP can decay through R-parity violating (RPV) operators becomes more natural (for a review of R parity violation, see [14]) This allows for new dark matter annihilation spectra not normally considered in the simplest supersymmetric or secluded dark matter models. While our studies are conducted with a supersymmetric setup in mind, many results are applicable to a broader variety of secluded dark matter scenarios
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