  The galactic center excess of gamma ray photons can be naturally explained by
light Majorana fermions in combination with a pseudoscalar mediator. The NMSSM
provides exactly these ingredients. We show that for neutralinos with a
significant singlino component the galactic center excess can be linked to
invisible decays of the Standard-Model-like Higgs at the LHC. We find
predictions for invisible Higgs branching ratios in excess of 50 percent,
easily accessible at the LHC. Constraining the NMSSM through GUT-scale boundary
conditions only slightly affects this expectation. Our results complement
earlier NMSSM studies of the galactic center excess, which link it to heavy
Higgs searches at the LHC.
