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F\'eeton ($B-L$ Gauge Boson) Dark Matter for the 511-keV Gamma-Ray Excess and the Prediction of Low-energy Neutrino Flux
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abstract
The f\'eeton is the gauge boson of the $U(1)_{B-L}$ gauge theory. If the gauge coupling constant is extremely small, it becomes a candidate for dark matter. We show that its decay to a pair of electron and positron explains the observed Galactic 511-keV gamma-ray excess in a consistent manner. This f\'eeton dark matter decays mainly into pairs of neutrino and anti-neutrino. Future low-energy experiments with improved directional capability make it possible to capture those neutrino signals. The seesaw-motivated parameter space predicts a relatively short f\'eeton lifetime comparable to the current cosmological constraint.
Forward citations
Cited by 2 Pith papers
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A quality-coupling relation in chiral $U(1)_{B-L}$ axion model
In this chiral U(1)_{B-L} axion model, demanding high axion quality forces a minimal axion-electron coupling that can exceed standard KSVZ-model predictions.
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Minimal Majoron Dark Matter from a Discrete $Z_N$ Gauge Symmetry
Discrete Z_N-protected majoron dark matter excludes Z_5, leaves Z_7/Z_11/Z_13 viable, and predicts a 1–10 MeV Z_7 majoron testable by COSI through 511 keV and γγ lines.
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