cosmic no-hair conjecture
E418136
The cosmic no-hair conjecture is a theoretical proposal in cosmology stating that, under broad conditions, an expanding universe with a positive cosmological constant will evolve toward a homogeneous, isotropic de Sitter–like state, effectively erasing most information about its initial conditions.
All labels observed (1)
| Label | Occurrences |
|---|---|
| cosmic no-hair conjecture canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T4163785 — 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: cosmic no-hair conjecture Context triple: [eternal inflation, hasKeyConcept, cosmic no-hair conjecture]
-
A.
cosmic censorship conjecture
The cosmic censorship conjecture is a hypothesis in general relativity proposing that singularities arising from gravitational collapse are always hidden within event horizons, preventing "naked" singularities from being observed.
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B.
black hole no-hair theorem
The black hole no-hair theorem is a principle in general relativity stating that stationary black holes are completely characterized by only a few macroscopic parameters—mass, electric charge, and angular momentum—regardless of the details of the matter that formed them.
-
C.
conformal cyclic cosmology
Conformal cyclic cosmology is Roger Penrose’s speculative cosmological model proposing that the universe undergoes an infinite sequence of “aeons,” where the remote future of each becomes the Big Bang of the next through conformal geometry.
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D.
Hawking–Penrose singularity theorems
The Hawking–Penrose singularity theorems are foundational results in general relativity that show, under broad physical conditions, spacetime must contain singularities such as those inside black holes or at the Big Bang.
-
E.
dark energy
Dark energy is the mysterious form of energy thought to permeate all of space and drive the accelerating expansion of the universe.
- 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: cosmic no-hair conjecture Target entity description: The cosmic no-hair conjecture is a theoretical proposal in cosmology stating that, under broad conditions, an expanding universe with a positive cosmological constant will evolve toward a homogeneous, isotropic de Sitter–like state, effectively erasing most information about its initial conditions.
-
A.
cosmic censorship conjecture
The cosmic censorship conjecture is a hypothesis in general relativity proposing that singularities arising from gravitational collapse are always hidden within event horizons, preventing "naked" singularities from being observed.
-
B.
black hole no-hair theorem
The black hole no-hair theorem is a principle in general relativity stating that stationary black holes are completely characterized by only a few macroscopic parameters—mass, electric charge, and angular momentum—regardless of the details of the matter that formed them.
-
C.
conformal cyclic cosmology
Conformal cyclic cosmology is Roger Penrose’s speculative cosmological model proposing that the universe undergoes an infinite sequence of “aeons,” where the remote future of each becomes the Big Bang of the next through conformal geometry.
-
D.
Hawking–Penrose singularity theorems
The Hawking–Penrose singularity theorems are foundational results in general relativity that show, under broad physical conditions, spacetime must contain singularities such as those inside black holes or at the Big Bang.
-
E.
dark energy
Dark energy is the mysterious form of energy thought to permeate all of space and drive the accelerating expansion of the universe.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
cosmological conjecture
ⓘ
theoretical proposal in cosmology ⓘ |
| analogyWith | black hole no-hair theorems ⓘ |
| appliesTo |
inflationary phases driven by nearly constant potential energy
ⓘ
universes with dark energy modeled as a cosmological constant ⓘ |
| assumes |
certain energy conditions on matter fields
ⓘ
expanding universe ⓘ positive cosmological constant or effective vacuum energy ⓘ |
| comparedTo | observed near-isotropy of the cosmic microwave background ⓘ |
| concerns |
late-time attractor behavior of cosmological solutions
ⓘ
universes with positive vacuum energy ⓘ |
| describes | asymptotic behavior of expanding universes with positive cosmological constant ⓘ |
| field |
cosmology
ⓘ
general relativity ⓘ physical cosmology ⓘ |
| hasConsequence |
inflationary expansion tends to smooth out initial irregularities
ⓘ
observed large-scale homogeneity of the universe can be explained by accelerated expansion ⓘ |
| implies |
anisotropies decay in the presence of a positive cosmological constant
ⓘ
cosmological constant dominates the energy density at late times ⓘ inhomogeneities are diluted by accelerated expansion ⓘ late-time universe forgets most details of its initial conditions ⓘ |
| influences |
interpretation of inflation as a smoothing mechanism
ⓘ
theoretical expectations for the far future of a Λ-dominated universe ⓘ |
| involvesConcept |
accelerated expansion
ⓘ
attractor solutions in dynamical systems ⓘ homogeneity ⓘ isotropy ⓘ |
| mayFailIf |
cosmological constant is non-positive
ⓘ
exotic matter or fields maintain large anisotropies ⓘ strong violations of standard energy conditions occur ⓘ |
| motivatedBy | desire to understand generic outcomes of cosmological evolution with Λ>0 ⓘ |
| predicts |
approach to a de Sitter–like metric at late times
ⓘ
exponential suppression of anisotropic shear ⓘ loss of memory of most initial anisotropies and inhomogeneities ⓘ |
| relatesTo |
Bianchi cosmological models
ⓘ
cosmic censorship conjecture ⓘ cosmological constant ⓘ de Sitter space ⓘ
linked to:
de Sitter spacetime
inflationary cosmology ⓘ no-hair theorem for black holes ⓘ
linked to:
black hole no-hair theorem
|
| statesThat |
an expanding universe with a positive cosmological constant generically evolves toward a de Sitter–like state
ⓘ
under broad conditions an initially anisotropic universe becomes asymptotically homogeneous and isotropic ⓘ |
| status |
not proven in full generality
ⓘ
partially proven for specific classes of cosmological models ⓘ |
| supportedBy |
analyses of Bianchi cosmologies with a cosmological constant
ⓘ
mathematical results on stability of de Sitter space in general relativity ⓘ |
| timeScale | asymptotic late-time evolution of the universe ⓘ |
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: cosmic no-hair conjecture Description of subject: The cosmic no-hair conjecture is a theoretical proposal in cosmology stating that, under broad conditions, an expanding universe with a positive cosmological constant will evolve toward a homogeneous, isotropic de Sitter–like state, effectively erasing most information about its initial conditions.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.