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5min chapter
AMA | August 2023
Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
The Importance of Euclidean Quantum Gravity
Hawking: In quantum field theory, you're integrating over the space of all possible metrics. And now these metrics are Euclidean metrics rather than spacetime metrics. Half of it is this rotation from real time to imaginary time. The other half is in the context of quantum cosmology dramatically cutting down on the number of degrees of freedom that you're considering by just assuming that the universe is homogeneous and isotropic - called mini super space models.
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