What question did this study set out to answer?

The aim is to introduce a cosmological model characterized by spacetime defects rather than curvature singularities.

March 26, 2026

CPT-conjugated worlds from a degenerate cosmological metric

Key Points

The aim is to introduce a cosmological model characterized by spacetime defects rather than curvature singularities.
Propose a model with a cosmological time-defect and a wormhole space-defect.
Describe these defects using a degenerate spacetime metric with a vanishing determinant on two hypersurfaces.
Interpret the segments as pairs of CPT-conjugated worlds.
Identified four segments in the universe corresponding to two pairs of twin worlds.
Discussed the implications of classical communication between these four worlds.

Abstract

A cosmological model is proposed, which has spacetime defects instead of curvature singularities. We combine, in fact, a cosmological time-defect and a wormhole space-defect, where these two defects are described by a degenerate spacetime metric with vanishing determinant on two hypersurfaces. There are then four segments in this universe, which can be interpreted as two pairs of CPT-conjugated worlds (two pairs of twin worlds). We discuss, in some detail, the issue of classical communication between these four worlds.

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CPT-conjugated worlds from a degenerate cosmological metric

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