Shape of the Universe
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The shape of the universe is a matter of debate in physical cosmology over the local and global geometry of the universe which considers both curvature and topology, though, strictly speaking, it goes beyond both. In practice, more formally, the debate seeks a 3-manifold that corresponds to the spatial section (in comoving coordinates) of the 4-dimensional space-time of the universe.
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See also
- Nature is an infinite sphere, whose center is everywhere and whose circumference is nowhere
- Doughnut theory of the universe
- Ekpyrotic universe − a String theory-related model depicting a five-dimensional, membrane-shaped universe; an alternative to the Hot Big Bang Model, whereby the universe is described to have originated when two membranes collided at the fifth dimension.
- Extra dimensions in String Theory for 6 or 7 extra space-like dimensions all with a compact topology.
- History of the Center of the Universe
- List of Cosmology paradoxes
- Theorema Egregium − The "remarkable theorem" discovered by Gauss which showed there is an intrinsic notion of curvature for surfaces. This is used by Riemann to generalize the (intrinsic) notion of curvature to higher dimensional spaces.
- Zero-energy universe
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