Density matrices in quantum gravity
We study density matrices in quantum gravity, focusing on topology change. We argue that the inclusion of bra-ket wormholes in the gravity path integral is not a free choice, but is dictated by the specification of a global state in the multi-universe Hilbert space. Specifically, the Hartle-Hawki...
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| Format: | Article |
| Language: | English |
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SciPost
2020-10-01
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| Series: | SciPost Physics |
| Online Access: | https://scipost.org/SciPostPhys.9.4.045 |