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- W3129075791 abstract "The quantum gravity path integral involves a sum over topologies that invites comparisons to worldsheet string theory and to Feynman diagrams of quantum field theory. However, the latter are naturally associated with the non-abelian algebra of quantum fields, while the former has been argued to define an abelian algebra of superselected observables associated with partition-function-like quantities at an asymptotic boundary. We resolve this apparent tension by pointing out a variety of discrete choices that must be made in constructing a Hilbert space from such path integrals, and arguing that the natural choices for quantum gravity differ from those used to construct QFTs. We focus on one-dimensional models of quantum gravity in order to make direct comparisons with worldline QFT." @default.
- W3129075791 created "2021-02-15" @default.
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- W3129075791 date "2021-01-28" @default.
- W3129075791 modified "2023-09-27" @default.
- W3129075791 title "Baby Universes and Worldline Field Theories" @default.
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