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Light and Heavy Dark Matter Particles
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It has recently been pointed out that the 511 keV emission line detected by Integral/SPI from the bulge of our galaxy could be explained by annihilations of light Dark Matter particles into e^+ e^-. If such a signature is confirmed, then one might expect a conflict with the interpretation of very high energy gamma rays if they also turn out to be due to Dark Matter annihilations. Here, we propose a way to accomodate the existence of both signals being produced by Dark Matter annihilations through the existence of two stable (neutral) Dark Matter particles, as is possible in theories inspired from N=2 supersymmetry.
Forward citations
Cited by 6 Pith papers
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Constraints on Sub-MeV Dark Matter from Solar Reflection with DAMIC-M
With ~1.3 kg-day of DAMIC-M skipper-CCD data, solar-reflected dark matter yields 90% CL limits on the DM-electron cross section reaching 3.16e-37 cm2 at 0.1 MeV for an ultralight mediator.
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Neutrino lines and photon continua from cascade dark matter decay
In cascade dark-matter decay, neutrino-line searches can beat gamma-ray limits whenever the intermediate mediator is long-lived enough to suppress the photon flux.
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FIMPs in a two-component dark matter model with $Z_2 \times Z_4$ symmetry
In this two-component dark matter model, freeze-in works with masses up to 3 TeV only if the scalar portal coupling is as small as 10^-25, far below usual FIMP values.
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First Production of Skipper-CCD Modules for the DAMIC-M Experiment
DAMIC-M completed production of 28 skipper-CCD modules, selected from 188 tested CCDs, with measured performance and added radioactivity within the experiment's background budget.
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Super-Kamiokande Strongly Constrains Leptophilic Dark Matter Capture in the Sun
Super-Kamiokande data constrains the DM-electron scattering cross-section for leptophilic dark matter to ~4e-41 cm2 below 100 GeV, exceeding direct detection by over an order of magnitude.
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Sub-GeV Dark Matter Under Pressure from Direct Detection
PandaX-4T S2-only data yields world-leading sub-GeV dark matter-electron scattering limits for heavy mediators in the 20-200 MeV range, although the result largely overlaps with the collaboration's own just-released analysis.
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