A two-state dark matter model with velocity-dependent upscattering can produce a Galactic Center gamma-ray signal while suppressing dwarf galaxy signals, breaking the usual correlation between the two.
Since a0 is also odd under parity, the only allowed coupling betweena0 and the DM sector is L⊃−iyχ 2 a0 χχ−χcχc + h.c
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dSphobic Dark Matter
A two-state dark matter model with velocity-dependent upscattering can produce a Galactic Center gamma-ray signal while suppressing dwarf galaxy signals, breaking the usual correlation between the two.