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math.DG2024★ 1 cited
Pseudo-timelike loops in signature changing semi-Riemannian manifolds with a transverse radical
N. E. Rieger, W. Hasse
In 1983, Hartle and Hawking proposed the no-boundary proposal, suggesting that the universe has no beginning in the sense of a spacetime singularity or boundary. Nevertheless, ther…
math.DG2024★ 1 cited
A Transformation Theorem for Transverse Signature-Type Changing Semi-Riemannian Manifolds
W. Hasse, N. E. Rieger
In the early eighties Hartle and Hawking put forth that signature-type change may be conceptually interesting, paving the way to the so-called 'no boundary' proposal for the initia…