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Flatness problem

The flatness problem (also known as the oldness problem) is a cosmological fine-tuning problem within the Big Bang model of the universe. Measurements find the current universe close to perfectly flat and expansion of the universe increases flatness. Consequently the early universe must have been exceptionally close to flat. In standard cosmology based…

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Overview

Flatness

Energy density and the Friedmann equation

Current value of Ω

Solutions to the problem

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Flatness problem

Nodes84
Edges83
Triples54
Avg. degree1.98
Density0.02381
Components1

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Flatness problem

Top relations

related to Inflation · 11
Flatness problem → Alan Guth, Friedmann Equation, Guth, He, His, However, In December, Indeed, Recalling, The, Therefore
related to Post inflation · 10
Flatness problem → Although, Bayesian, Coles, Despite, Evrard, For, In, Many, The, These
related to Einstein–Cartan theory · 9
Flatness problem → As, Cartan, Dirac, Einstein, Kibble, Sciama, The, This, Universe
related to Implication · 7
Flatness problem → Big Bang, Big Crunch, If, In, Indeed, Robert Dicke, This
related to Anthropic principle · 6
Flatness problem → Collins, If, In, One, Stephen Hawking, The
related to Solutions to the problem · 5
Flatness problem → But, Dicke, Several, Some, That

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Important terminology

universe density problem flatness value displaystyle matter one flat rho energy inflation curvature since would time anthropic theory different close

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
galaxiesinstance ofIn either case the universe would contain no complex structures0.80text
starsinstance ofIn either case the universe would contain no complex structures0.80text
planetsinstance ofIn either case the universe would contain no complex structures0.80text
any form of life.This problem with the Big Bang model was first pointed out by Robert Dicke in 1969instance ofIn either case the universe would contain no complex structures0.80text
and it motivated a search for some reason the density should take such a specific valueinstance ofIn either case the universe would contain no complex structures0.80text
humansinstance ofonly those universes with exactly the correct density for forming galaxies and stars would give rise to intelligent observers0.80text
Flatness problemrelated to Anthropic principleOne0.60section
Flatness problemrelated to Anthropic principleIf0.60section
Flatness problemrelated to Anthropic principleThe0.60section
Flatness problemrelated to Anthropic principleCollins0.60section
Flatness problemrelated to Anthropic principleStephen Hawking0.60section
Flatness problemrelated to Anthropic principleIn0.60section

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