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I describe how we can understand the classical appearance of our world from a universal quantum theory. The essential ingredient is the process of decoherence. I start with a general discussion in ordinary quantum theory and then turn to quantum gravity and quantum cosmology. There is a whole hierarchy of classicality from the global gravitational field to the fluctuations in the cosmic microwave background, which serve as the seeds for the structure in the Universe.
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Related Publications
Claus Kiefer
October 1990,
Physical review. D, Particles and fields,
Claus Kiefer
July 2013,
Physical review letters,
Claus Kiefer
February 1988,
Physical review. D, Particles and fields,
Claus Kiefer
September 2004,
Physical review letters,
Claus Kiefer
May 1989,
Physical review. D, Particles and fields,
Claus Kiefer
May 2014,
Science (New York, N.Y.),
