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Dark matter particle annihilation or decay can produce monochromaticgamma-ray lines and contribute to the diffuse gamma-ray background. Flux upperlimits are presented for gamma-ray spectral lines from 7 to 200 GeV and for thediffuse gamma-ray background from 4.8 GeV to 264 GeV obtained from two years ofFermi Large Area Telescope data integrated over most of the sky. We give crosssection upper limits and decay lifetime lower limits for dark matter modelsthat produce gamma-ray lines or contribute to the diffuse spectrum, includingmodels proposed as explanations of the PAMELA and Fermi cosmic-ray data.

Fermi LAT Search for Dark Matter in Gamma-ray Lines and the Inclusive Photon Spectrum