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date: 28 November 2021

p. 666. The material worldlocked

p. 666. The material worldlocked

  • John Gribbin


‘The material world’ explores the nature of matter. The amount of matter in the universe can be estimated by the overall curve of spacetime (Ω). Baryonic matter is actually only a tiny amount of the Universe, giving Ω(baryon) = 0.04. Adding the curve from cold dark matter (CDM) brings the total to 0.27. The remaining curve comes from the cosmological constant, which brings Ω to almost exactly 1 — meaning the Universe is flat. Different galaxies exist within this ΛCDM framework, and interactions between their cores lead to starburst activity. The light we see from distant galaxies is millions of years old, and can be used to investigate galaxy formation.

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