big bang nucleosynthesis
E24000
Big bang nucleosynthesis is the early-universe process, occurring within the first few minutes after the Big Bang, in which light atomic nuclei such as hydrogen, helium, and small amounts of other elements were formed.
Aliases (2)
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
cosmological process
→
nucleosynthesis process → physical process → |
| alsoKnownAs |
BBN
→
primordial nucleosynthesis → |
| constrains |
baryon density of the universe
→
number of relativistic species in the early universe → possible new physics beyond the Standard Model → |
| dependsOn |
baryon-to-photon ratio
→
expansion rate of the universe → neutron-to-proton ratio → number of light neutrino species → |
| differentFrom |
stellar nucleosynthesis
→
|
| doesNotProduce |
significant amounts of elements heavier than lithium
→
|
| endsWhen |
universe becomes too cool and diffuse for further nuclear fusion
→
|
| explainsAbundanceOf |
primordial deuterium
→
primordial helium → primordial lithium → |
| follows |
quark–hadron transition
→
|
| hasOpenProblem |
cosmological lithium problem
→
|
| helium4MassFraction |
about 25 percent
→
|
| hydrogenMassFraction |
about 75 percent
→
|
| involves |
neutron–proton interconversion
→
nuclear fusion reactions → weak interaction processes → |
| occursAtRedshift |
greater than 10^8
→
|
| occursAtTemperature |
about 0.1 to 1 MeV
→
about 1 billion kelvin → |
| occursIn |
early universe
→
|
| precedes |
formation of the cosmic microwave background
→
recombination → |
| primaryProduct |
helium-4
→
hydrogen-1 → |
| produces |
deuterium
→
helium-3 → helium-4 → hydrogen-1 → light atomic nuclei → lithium-7 → trace amounts of beryllium-7 → |
| providesEvidenceFor |
Big Bang model
→
|
| relatedTo |
stellar nucleosynthesis
→
|
| sensitiveTo |
cosmological parameters
→
|
| startsWhen |
universe cools below about 1 billion kelvin
→
|
| studiedIn |
astrophysics
→
physical cosmology → |
| tests |
standard cosmological model
→
|
| timeAfterBigBang |
approximately 1 to 20 minutes
→
first few minutes → |
Referenced by (4)
| Subject (surface form when different) | Predicate |
|---|---|
|
Albedo 0.39
("Nucleogenesis (Part One)")
→
|
hasTrack |
|
Big Bang cosmology
("Big Bang nucleosynthesis")
→
|
includes |
|
deuteron
→
|
isProducedIn |
|
James Peebles
("Big Bang nucleosynthesis")
→
|
knownFor |