Raphael Bousso - Why Believe in Multiple Universes?

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Multiple universes used to be pure speculation. Today, most cosmologists are sure they exist, perhaps in many forms and almost certainly in vast numbers, perhaps infinite in size and scope. What caused multiple universes to go from far-out guesswork to conventional wisdom? And does anyone challenge the new belief?

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Raphael Bousso is a theoretical physicist and string theorist. He is a professor at Department of Physics, UC Berkeley. He is known for the proposal of Bousso's holographic bound, also known as the covariant entropy bound.

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