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- W1730822017 abstract "The action in general relativity (GR), which is an integral over the manifold plus an integral over the boundary, is a global object and is only well defined when the topology is fixed. Therefore, to use the action in GR and in most approaches to quantum gravity (QG) based on a covariant Lorentzian action, there needs to exist a prefered (global) timelike vector, and hence a global topology $R times S^3$, for it to make sense. This is especially true in the Hamiltonian formulation of QG. Therefore, in order to do canonical quantization, we need to know the topology, appropriate boundary conditions and (in an open manifold) the conditions at infinity, which affects the fundamental geometrical scalar invariants of the spacetime (and especially those which may occur in the QG action)." @default.
- W1730822017 created "2016-06-24" @default.
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- W1730822017 date "2015-03-16" @default.
- W1730822017 modified "2023-10-17" @default.
- W1730822017 title "On the Action, Topology and Geometric Invariants in Quantum Gravity" @default.
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- W1730822017 doi "https://doi.org/10.48550/arxiv.1503.04775" @default.
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