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Cosmic inflation

Inflation explains why the universe is so flat and uniform, and its predictions for the spectrum of density fluctuations have been confirmed. Its signature in primordial gravitational waves, B-mode polarization, has not been seen. BICEP2 announced a detection in 2014 that turned out to be galactic dust.

Posed 1980, Alan Guth.

Sources

Origins of the universe · Cosmos

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