
TL;DR
This paper explores how classical and quantum gravitational effects, especially child universes and wormholes, could resolve singularities, regularize UV divergences, and influence black hole and early universe phenomena.
Contribution
It proposes that child universes and wormholes can address singularity and UV divergence issues, linking quantum gravity effects with observable cosmological and black hole phenomena.
Findings
Child universes may carry away high-energy excitations, preventing UV divergences.
Modifications to General Relativity can eliminate classical singularities.
Child universe production could serve as a natural UV regularization mechanism.
Abstract
Evidence to the case that classical gravitation provides the clue to make sense out of quantum gravity is presented. The key observation is the existence in classical gravitation of child universe solutions or "almost" solutions, "almost" because of some singularity problems. The difficulties of these child universe solutions due to their generic singularity problems will be very likely be cured by quantum effects, just like for example "almost" instanton solutions are made relevant in gauge theories with breaking of conformal invariance. Some well motivated modifcations of General Relativity where these singularity problems are absent even at the classical level are discussed. High energy density excitations, responsible for UV divergences in quantum field theories, including quantum gravity, are likely to be the source of child universes which carry them out of the original space…
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