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Signals of a light dark force in the galactic center

Weiner, Neal; Liu, Jia; Xue, Wei

Recent evidence for an excess of gamma rays in the GeV energy range about the Galactic Center have refocused attention on models of dark matter in the low mass regime ( m _χ ≲ m _Z /2). Because this is an experimentally well-trod energy range, it can be a challenge to develop simple models that explain this excess, consistent…