The Cosmological Principle is a Copernican idea. It means we are not in special place. The Cosmological Principle allows the universe to change, or evolve throughout time. An extension of the cosmological principle called the perfect cosmological principle says that the universe also does not change with time, there is no evolution. We are interested in various aspects of models of the diffuse cosmological X-ray background, in particular its origin, spatial fluctuations, and what it can tell us about large scale structure. More recently, the emphasis is shifting toward the gamma-ray background.
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