Cauchy horizon
E340280
A Cauchy horizon is a lightlike boundary in certain spacetime solutions of general relativity, such as rotating black holes, beyond which the deterministic evolution from initial data breaks down.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Cauchy horizon canonical | 2 |
| future Cauchy horizon | 1 |
| null Cauchy horizon | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3236660 — 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: Cauchy horizon Context triple: [Kerr Penrose diagram, includes, Cauchy horizon]
-
A.
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.
-
B.
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.
-
C.
Event Horizon
Event Horizon is a 1997 science fiction horror film about a rescue crew investigating a spaceship that disappeared into a black hole and returned with a malevolent presence.
-
D.
Kruskal–Szekeres coordinates
Kruskal–Szekeres coordinates are a maximal extension coordinate system used in general relativity to smoothly describe the entire spacetime of a Schwarzschild black hole, including regions across the event horizon.
-
E.
Kerr Penrose diagram
The Kerr Penrose diagram is a conformal spacetime diagram depicting the causal structure of a rotating (Kerr) black hole, including its event horizons, ergoregions, and extended regions.
- 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: Cauchy horizon Target entity description: A Cauchy horizon is a lightlike boundary in certain spacetime solutions of general relativity, such as rotating black holes, beyond which the deterministic evolution from initial data breaks down.
-
A.
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.
-
B.
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.
-
C.
Event Horizon
Event Horizon is a 1997 science fiction horror film about a rescue crew investigating a spaceship that disappeared into a black hole and returned with a malevolent presence.
-
D.
Kruskal–Szekeres coordinates
Kruskal–Szekeres coordinates are a maximal extension coordinate system used in general relativity to smoothly describe the entire spacetime of a Schwarzschild black hole, including regions across the event horizon.
-
E.
Kerr Penrose diagram
The Kerr Penrose diagram is a conformal spacetime diagram depicting the causal structure of a rotating (Kerr) black hole, including its event horizons, ergoregions, and extended regions.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
boundary in spacetime
ⓘ
concept in general relativity ⓘ null hypersurface ⓘ |
| appearsIn | exact analytic solutions of Einstein field equations ⓘ |
| associatedWith |
blue-shift of infalling radiation
ⓘ
inner horizon of Kerr black hole ⓘ inner horizon of Reissner–Nordström black hole ⓘ mass inflation instability ⓘ |
| canBe |
Cauchy horizon
self-linksurface differs
ⓘ
surface form:
future Cauchy horizon
past Cauchy horizon ⓘ |
| characterizedBy |
breakdown of global hyperbolicity beyond it
ⓘ
failure of unique evolution from initial data beyond it ⓘ |
| contrastedWith |
apparent horizon
ⓘ
event horizon ⓘ |
| defines | limit of deterministic evolution from Cauchy data ⓘ |
| field | general relativity ⓘ |
| generatedBy | null geodesics ⓘ |
| hasConsequence |
loss of predictability beyond the horizon
ⓘ
possible non-uniqueness of spacetime extensions ⓘ potential violation of determinism in classical general relativity ⓘ |
| hasProperty |
boundary of domain of dependence
ⓘ
lightlike ⓘ null ⓘ |
| hasType |
Cauchy horizon
self-linksurface differs
ⓘ
surface form:
null Cauchy horizon
weak null singularity (in some models) ⓘ |
| implies | spacetime is not globally hyperbolic ⓘ |
| isBoundaryOf | maximal Cauchy development of initial data ⓘ |
| mathematicallyDefinedAs | boundary of the domain of dependence of a partial Cauchy surface ⓘ |
| namedAfter |
Augustin-Louis Cauchy
ⓘ
surface form:
Augustin-Louis Cauchy (via Cauchy problem terminology)
|
| occursIn |
Kerr metric
ⓘ
surface form:
Kerr spacetime
Kerr–Newman black hole ⓘ
surface form:
Kerr–Newman spacetime
Reissner–Nordström metric ⓘ
surface form:
Reissner–Nordström spacetime
certain cosmological models ⓘ charged black hole solutions ⓘ rotating black hole solutions ⓘ |
| relatedTo |
Cauchy surface
ⓘ
cosmic censorship conjecture ⓘ domain of dependence ⓘ global hyperbolicity ⓘ strong cosmic censorship conjecture ⓘ |
| requires | existence of a partial Cauchy surface ⓘ |
| studiedInContextOf |
black hole interiors
ⓘ
gravitational collapse ⓘ stability analysis of spacetime solutions ⓘ |
| topologically | three-dimensional hypersurface in four-dimensional spacetime ⓘ |
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: Cauchy horizon Description of subject: A Cauchy horizon is a lightlike boundary in certain spacetime solutions of general relativity, such as rotating black holes, beyond which the deterministic evolution from initial data breaks down.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Penrose–Carter diagram
this entity surface form:
future Cauchy horizon
this entity surface form:
null Cauchy horizon