MG11 
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Interconnections between Black Holes, Magnetic Fields, and CR's

I review the interconnections among these, focusing on consequences of energy efficiency and magnetic field generation by massive black holes. The remarkable conversion efficiency from gravitational to magnetic energy is discussed. Although it is ill- understood, recent global tests already serve to constrain magnetic field creation scenarios from BH's. Energy flows and magnetic fields arising from galactic black holes are discussed, and the close connections to Cosmic ray acceleration issues. New radio detections of diffuse extragalactic radio emission on degree-scales will be described, and also the first attempts to directly probe magnetic fields in cosmological large scale structure by Faraday rotation. These are compared with theoretical predictions of diffuse magnetic field strengths.

TBD