Search for ultra-high energy photons with the Pierre Auger Observatory

Abstract The Pierre Auger Observatory [1] has an unprecedented sensitivity to photons at energies above 10 18  eV. Particularly the combination of ground array and fluorescence detection techniques offers a unique power to discriminate the primary particles based on different observables. Implications of photon searches extend from astrophysics to fundamental and particle physics. Current results and future prospects are reported.