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Galaxy clusters are the most massive systems in the known universe. They hostrelativistic cosmic ray populations and are thought to be gravitationally boundby large amounts of Dark Matter, which under the right conditions could yieldto a detectable $\gamma$-ray flux. Prior to the launch of the Fermi satellite,predictions were optimistic that Galaxy clusters would be established as$\gamma$-ray bright objects by observations through its prime instrument, theLarge Area Telescope (LAT). Yet, despite numerous efforts, even a singlecluster detection is still pending.

Galaxy Clusters with the Fermi-LAT: Status and Implications for Cosmic Rays and Dark Matter Physics