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Dark Matter and the XENON1T electron recoil excess
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abstract
We show that the electron recoil excess around 2 keV claimed by the Xenon collaboration can be fitted by DM or DM-like particles having a fast component with velocity of order $\sim 0.1$. Those particles cannot be part of the cold DM halo of our Galaxy, so we speculate about their possible nature and origin, such as fast moving DM sub-haloes, semi-annihilations of DM and relativistic axions produced by a nearby axion star. Feasible new physics scenarios must accommodate exotic DM dynamics and unusual DM properties.
Forward citations
Cited by 2 Pith papers
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Kinetically Coupled Dark Matter Condensates
Kinetic coupling to a moduli field enlarges the axion Jeans scale, and existing cosmological limits force the moduli field below roughly 100 TeV for the model to remain viable.
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Direct detection of solar chameleons with electron recoil data from XENONnT
XENONnT electron-recoil data bound solar chameleons to log10 β_eff < −6.9, independent of the potential index n for inverse power-law chameleons at the dark-energy scale.
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