Wineglass wormholes, which can nucleate expanding baby universes, continuously connect to no-boundary instantons as their charge vanishes.
A small Universe
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Switching to 3-torus topology and summing SL(3,Z) geometries via automorphic forms makes the no-boundary wavefunction favor large inflating universes with over 250 e-folds, plus CMB corrections from torus moduli.
citing papers explorer
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Birth of Inflationary Universes via Wineglass Wormholes and their No-Boundary Relatives
Wineglass wormholes, which can nucleate expanding baby universes, continuously connect to no-boundary instantons as their charge vanishes.
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Inflation and topology from the no-boundary state
Switching to 3-torus topology and summing SL(3,Z) geometries via automorphic forms makes the no-boundary wavefunction favor large inflating universes with over 250 e-folds, plus CMB corrections from torus moduli.