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...
| Autor principal: | |
|---|---|
| Format: | Article |
| Idioma: | English |
| Publicat: |
SciPost
2020-10-01
|
| Col·lecció: | SciPost Physics |
| Accés en línia: | https://scipost.org/SciPostPhys.9.4.045 |