James M. Bardeen is an American theoretical physicist renowned for his contributions to the fields of cosmology and general relativity. He is particularly well-known for his work on black holes, including the formulation of the "no-hair theorem," which suggests that black holes can be fully described by just three observable properties: mass, electric charge, and angular momentum. Bardeen also made significant contributions to the understanding of the early universe and the inflationary theory of cosmology.
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