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• W2022032466 abstract "We contrast the two approaches to ``classical'' signature change used by Hayward with the one used by us (Hellaby and Dray). There is (as yet) no rigorous derivation of appropriate distributional field equations. Hayward's distributional approach is based on a postulated modified form of the field equations. We make an alternative postulate. We point out an important difference between two possible philosophies of signature change---ours is strictly classical, while Hayward's Lagrangian approach adopts what amounts to an imaginary proper ``time'' on one side of the signature change, as is explicitly done in quantum cosmology. We also explain why we chose to use the Darmois-Israel-type junction conditions, rather than the Lichnerowicz-type junction conditions favored by Hayward. We show that the difference in results is entirely explained by the difference in philosophy (imaginary versus real Euclidean ``time''), and not by the difference in approach to junction conditions (Lichnerowicz with specific coordinates versus Darmois with general coordinates). textcopyright{} 1995 The American Physical Society." @default.
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• W2022032466 date "1995-12-15" @default.
• W2022032466 modified "2023-09-23" @default.
• W2022032466 title "Reply Comment: Comparison of approaches to classical signature change" @default.
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• W2022032466 doi "https://doi.org/10.1103/physrevd.52.7333" @default.
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