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4 years ago in Theoretical Physics By Lalit Mudra
What do we currently know about black holes and the Planck scale?
My research touches on quantum field theory in curved spacetime, and the black hole information paradox feels like the most prominent puzzle. But I know there are deeper issues regarding the nature of the singularity and the microstructure of spacetime at the Planck scale. What are the core problems that a theory of quantum gravity is expected to solve in the context of black holes?
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By Keshava Answered 3 years ago
The puzzles are profound and interlinked. The information paradox remains central: does unitarity break down when a black hole evaporates? Hawking's calculation suggested it does, which violates a bedrock quantum principle. This leads directly to the firewall paradox does a dramatic event occur at the horizon? Underlying both is the nature of the singularity, a breakdown of GR that quantum gravity must resolve. In my reading, the most promising approaches, like AdS/CFT holography, suggest the information is encoded on the horizon's surface, implying spacetime itself emerges from more fundamental quantum degrees of freedom. The challenge is extracting testable predictions from these ideas.
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