arXiv:hep-th/9409195hep-th
The Nature of Space and Time
Abstract
Three illustrated lectures given by Stephen Hawking as part of a series of six lectures with Roger Penrose on the nature of space and time sponsored by Princeton University Press.
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Linked by 2 identifiable commenters in 5 comments across 5 threads, from Mar 2018 to Jul 2023.
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My favorite "fun fact" about gravity is still this one[0]: > [Gravity] shapes the arena in which it acts, unlike other fields which act in a fixed spacetime background. From what I've seen, this fact is rather underappreciated by many of the folks doing (what they call) "quantum…
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> If gravity wasn't self interacting it wouldn't follow the shortest path that gravity itself creates. I don't know if this is the right way to think about this. Gravity follows all paths. In a sense, it is the path. Or, as Hawking described it[0]: > [Gravity] shapes the arena…
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> If a photon follows a curve around a large mass, it does so because that curve is the shortest path through spacetime, if I am not mistaken. Correct! > Maybe I am missing something, but how could a quantum theory of gravity explain curvature of spacetime? […] how would a…
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Many of you will be familiar with the Moore-Penrose pseudoinverse [0], a generalization of the matrix inverse which is defined for non-square matrices and zero matrices, frequently applied in machine learning and statistics. However, like Hawking, with whom he was a collaborator…
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> It’s become dogma. All the other fields in nature are quantized. There’s a sense that there’s nothing special about gravity — it’s just a field like any other — and therefore we should quantize it. I keep on citing Stephen Hawking here on HN, but it again seems very…
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