Fermi LAT Search for Dark Matter in Gamma-ray Lines and the Inclusive
  Photon Spectrum
  Dark matter particle annihilation or decay can produce monochromatic
gamma-ray lines and contribute to the diffuse gamma-ray background. Flux upper
limits are presented for gamma-ray spectral lines from 7 to 200 GeV and for the
diffuse gamma-ray background from 4.8 GeV to 264 GeV obtained from two years of
Fermi Large Area Telescope data integrated over most of the sky. We give cross
section upper limits and decay lifetime lower limits for dark matter models
that produce gamma-ray lines or contribute to the diffuse spectrum, including
models proposed as explanations of the PAMELA and Fermi cosmic-ray data.
