dark energy
E274702
Dark energy is the mysterious form of energy thought to permeate all of space and drive the accelerating expansion of the universe.
All labels observed (1)
| Label | Occurrences |
|---|---|
| dark energy canonical | 1 |
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
cosmological component
ⓘ
hypothetical form of energy ⓘ physical concept ⓘ |
| acceptedIn |
Lambda-CDM model
ⓘ
surface form:
standard cosmological model
|
| accountsFor | about 68% of the total energy density of the universe ⓘ |
| affects |
age of the universe inferred from cosmological models
ⓘ
growth of cosmic structure ⓘ |
| associatedWith |
negative pressure
ⓘ
repulsive gravity ⓘ |
| becameDominant | when the universe was about half its current age ⓘ |
| causes | accelerating expansion of the universe ⓘ |
| constrains | future fate of the universe ⓘ |
| contrastedWith |
dark matter
ⓘ
ordinary baryonic matter ⓘ |
| describedBy | equation of state parameter w ⓘ |
| dominates | energy density of the universe at late times ⓘ |
| firstEvidenceAppearedIn | late 1990s supernova observations ⓘ |
| hasDensityParameter | Omega_Lambda approximately 0.7 in current best-fit models ⓘ |
| hasEffect | increasing the Hubble parameter at late times relative to matter-only models ⓘ |
| hasProperty | equation of state parameter w approximately equal to -1 ⓘ |
| hasUncertainty |
precise nature
ⓘ
time evolution of equation of state ⓘ |
| inferredFrom |
Type Ia supernova observations
ⓘ
baryon acoustic oscillations ⓘ cosmic microwave background measurements ⓘ large-scale structure surveys ⓘ |
| introducedToExplain | observed acceleration of cosmic expansion ⓘ |
| isComponentOf | Lambda-CDM model ⓘ |
| isNot |
directly detectable in laboratory experiments
ⓘ
well understood theoretically ⓘ |
| mayBeModeledAs |
cosmological constant
ⓘ
modified gravity effects ⓘ quintessence field ⓘ vacuum energy ⓘ |
| mayCause |
Big Rip scenario in some models
ⓘ
eternal accelerated expansion ⓘ |
| opposes | gravitational attraction on cosmological scales ⓘ |
| parameterizedBy | density parameter Omega_Lambda ⓘ |
| permeates | all of space ⓘ |
| relatedTo |
cosmological constant problem
ⓘ
fine-tuning problem in cosmology ⓘ |
| requires | precision cosmological observations to constrain its properties ⓘ |
| studiedIn | observational cosmology ⓘ |
| studiedUsing |
galaxy redshift surveys
ⓘ
supernova surveys ⓘ weak gravitational lensing ⓘ |
| symbolizedBy | Λ in the ΛCDM model when treated as cosmological constant ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.