Statements (14)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
cosmological parameter
|
| gptkbp:component |
total density parameter (Omega)
|
| gptkbp:decreases_as |
a^-4 (scale factor to the -4th power)
|
| gptkbp:describes |
fraction of the critical density of the universe in the form of radiation
|
| gptkbp:hasUnit |
dimensionless
|
| https://www.w3.org/2000/01/rdf-schema#label |
radiation density (Omega r)
|
| gptkbp:includes |
photons
relativistic neutrinos |
| gptkbp:relatedTo |
early universe
|
| gptkbp:symbol |
Ω_r
|
| gptkbp:used_in |
gptkb:Friedmann_equations
|
| gptkbp:value_at_present_epoch |
~5 x 10^-5
|
| gptkbp:bfsParent |
gptkb:matter_density_(Omega_m)
|
| gptkbp:bfsLayer |
7
|