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 (2)
| Label | Occurrences |
|---|---|
| dark energy canonical | 2 |
| Lambda (Λ, cosmological constant or dark energy density) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2527846 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: dark energy Context triple: [Alexei Filippenko, researchInterest, dark energy]
-
A.
observable universe
The observable universe is the portion of the entire cosmos that we can in principle detect or observe from Earth, limited by the finite speed of light and the age of the universe.
-
B.
Lambda-CDM model
The Lambda-CDM model is the standard cosmological framework describing a universe dominated by dark energy (Λ) and cold dark matter (CDM), successfully explaining the large-scale structure, expansion history, and cosmic microwave background observations.
-
C.
inflationary universe theory
Inflationary universe theory is a cosmological model proposing that the early universe underwent an extremely rapid exponential expansion, explaining its large-scale uniformity and structure.
-
D.
The Expanding Universe
"The Expanding Universe" is a chapter in Stephen Hawking’s popular science book *A Brief History of Time* that explains how observations and cosmological theory reveal that the universe is growing larger over time.
-
E.
FLRW cosmological models
FLRW cosmological models are a family of solutions to Einstein’s field equations that describe a homogeneous and isotropic expanding or contracting universe, forming the standard framework for modern cosmology.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: dark energy Target entity description: Dark energy is the mysterious form of energy thought to permeate all of space and drive the accelerating expansion of the universe.
-
A.
observable universe
The observable universe is the portion of the entire cosmos that we can in principle detect or observe from Earth, limited by the finite speed of light and the age of the universe.
-
B.
Lambda-CDM model
The Lambda-CDM model is the standard cosmological framework describing a universe dominated by dark energy (Λ) and cold dark matter (CDM), successfully explaining the large-scale structure, expansion history, and cosmic microwave background observations.
-
C.
inflationary universe theory
Inflationary universe theory is a cosmological model proposing that the early universe underwent an extremely rapid exponential expansion, explaining its large-scale uniformity and structure.
-
D.
The Expanding Universe
"The Expanding Universe" is a chapter in Stephen Hawking’s popular science book *A Brief History of Time* that explains how observations and cosmological theory reveal that the universe is growing larger over time.
-
E.
FLRW cosmological models
FLRW cosmological models are a family of solutions to Einstein’s field equations that describe a homogeneous and isotropic expanding or contracting universe, forming the standard framework for modern cosmology.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
cosmological component
ⓘ
hypothetical form of energy ⓘ physical concept ⓘ |
| acceptedIn |
standard cosmological model
ⓘ
linked to:
Lambda-CDM 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 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: dark energy Description of subject: Dark energy is the mysterious form of energy thought to permeate all of space and drive the accelerating expansion of the universe.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: dark energy