Zeldovich approximation
E456144
The Zeldovich approximation is a cosmological model that provides a simple, first-order description of the growth of large-scale structure in the universe by tracking how matter elements move under gravity from initially small density perturbations.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Zeldovich approximation canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4612411 — 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: Zeldovich approximation Context triple: [Yakov Borisovich Zeldovich, notableWork, Zeldovich approximation]
-
A.
Lemaître–Hubble law
The Lemaître–Hubble law is the fundamental cosmological relation that expresses the proportionality between a galaxy’s recessional velocity and its distance, providing the first observational evidence for the expansion of the universe.
-
B.
The Large-Scale Structure of the Universe
The Large-Scale Structure of the Universe is a foundational cosmology book by James Peebles that systematically develops the theory and observations of how matter is distributed on the largest cosmic scales.
-
C.
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.
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D.
Hubble constant H₀
The Hubble constant H₀ is the cosmological parameter that quantifies the present-day rate at which the universe is expanding, relating galaxies’ recession velocities to their distances.
-
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: Zeldovich approximation Target entity description: The Zeldovich approximation is a cosmological model that provides a simple, first-order description of the growth of large-scale structure in the universe by tracking how matter elements move under gravity from initially small density perturbations.
-
A.
Lemaître–Hubble law
The Lemaître–Hubble law is the fundamental cosmological relation that expresses the proportionality between a galaxy’s recessional velocity and its distance, providing the first observational evidence for the expansion of the universe.
-
B.
The Large-Scale Structure of the Universe
The Large-Scale Structure of the Universe is a foundational cosmology book by James Peebles that systematically develops the theory and observations of how matter is distributed on the largest cosmic scales.
-
C.
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.
-
D.
Hubble constant H₀
The Hubble constant H₀ is the cosmological parameter that quantifies the present-day rate at which the universe is expanding, relating galaxies’ recession velocities to their distances.
-
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 (44)
| Predicate | Object |
|---|---|
| instanceOf |
Lagrangian perturbation theory
ⓘ
cosmological model ⓘ first-order approximation ⓘ |
| appliesTo |
cold dark matter dominated universe
ⓘ
matter-dominated era of the universe ⓘ |
| approximates |
nonlinear gravitational evolution
ⓘ
particle trajectories as straight lines in comoving space with time-dependent amplitude ⓘ |
| assumes |
homogeneous and isotropic background universe
ⓘ
irrotational flow ⓘ pressureless dust matter ⓘ small initial density perturbations ⓘ |
| basedOn |
Lagrangian description of fluid flow
ⓘ
linear theory of gravitational instability ⓘ |
| breaksDownWhen | shell crossing occurs ⓘ |
| describes |
evolution of density perturbations in an expanding universe
ⓘ
growth of large-scale structure in the universe ⓘ trajectories of matter elements under gravity ⓘ |
| field |
astrophysics
ⓘ
gravitational dynamics ⓘ physical cosmology ⓘ |
| formulatedIn | Newtonian cosmology NERFINISHED ⓘ |
| hasLimitation |
does not accurately describe highly nonlinear virialized structures
ⓘ
ignores multistream velocity dispersion after shell crossing ⓘ |
| influenced | development of modern large-scale structure theory ⓘ |
| introducedIn | 1970s ⓘ |
| involves |
eigenvalues of deformation tensor
ⓘ
growth factor of linear perturbations ⓘ |
| namedAfter | Yakov Borisovich Zeldovich NERFINISHED ⓘ |
| predicts |
anisotropic collapse of matter
ⓘ
formation of caustics ⓘ nonlinear mapping from initial to final density field ⓘ pancake-like structures ⓘ |
| relatedTo |
adhesion approximation
ⓘ
cosmic web theory ⓘ higher-order Lagrangian perturbation theory ⓘ linear perturbation theory ⓘ |
| usedFor |
analytical studies of structure formation
ⓘ
initial conditions in N-body simulations ⓘ modeling large-scale structure formation ⓘ understanding cosmic web morphology ⓘ |
| uses |
comoving coordinates
ⓘ
displacement field ⓘ initial density perturbation field ⓘ |
| validWhen | density contrasts are moderate ⓘ |
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: Zeldovich approximation Description of subject: The Zeldovich approximation is a cosmological model that provides a simple, first-order description of the growth of large-scale structure in the universe by tracking how matter elements move under gravity from initially small density perturbations.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.