Penrose–Carter diagrams
E82076
Penrose–Carter diagrams are spacetime diagrams used in general relativity that compactify infinity to depict the global causal structure of solutions like black holes and cosmological models.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Penrose diagram | 4 |
| Penrose diagrams | 2 |
| Penrose–Carter diagram | 1 |
| Penrose–Carter diagrams canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T656159 — 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: Penrose–Carter diagrams Context triple: [Kruskal–Szekeres coordinates, relatedTo, Penrose–Carter diagrams]
-
A.
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.
-
B.
Schwarzschild Penrose diagram
The Schwarzschild Penrose diagram is a conformal spacetime diagram that compactly represents the causal structure of a non-rotating, uncharged black hole, including its event horizon and singularity.
-
C.
Reissner–Nordström Penrose diagram
The Reissner–Nordström Penrose diagram is a causal spacetime diagram depicting the global structure of a charged, non-rotating black hole, including its multiple horizons and extended regions.
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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.
Eddington–Finkelstein coordinates
Eddington–Finkelstein coordinates are a coordinate system in general relativity that smoothly covers a black hole’s event horizon, avoiding the coordinate singularity present in standard Schwarzschild coordinates.
- 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: Penrose–Carter diagrams Target entity description: Penrose–Carter diagrams are spacetime diagrams used in general relativity that compactify infinity to depict the global causal structure of solutions like black holes and cosmological models.
-
A.
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.
-
B.
Schwarzschild Penrose diagram
The Schwarzschild Penrose diagram is a conformal spacetime diagram that compactly represents the causal structure of a non-rotating, uncharged black hole, including its event horizon and singularity.
-
C.
Reissner–Nordström Penrose diagram
The Reissner–Nordström Penrose diagram is a causal spacetime diagram depicting the global structure of a charged, non-rotating black hole, including its multiple horizons and extended regions.
-
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.
Eddington–Finkelstein coordinates
Eddington–Finkelstein coordinates are a coordinate system in general relativity that smoothly covers a black hole’s event horizon, avoiding the coordinate singularity present in standard Schwarzschild coordinates.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
conformal diagram
ⓘ
spacetime diagram ⓘ tool in general relativity ⓘ |
| alternativeName |
Penrose–Carter diagrams
ⓘ
surface form:
Penrose diagram
|
| appliesTo |
FLRW cosmological models
ⓘ
surface form:
Friedmann–Lemaître–Robertson–Walker cosmologies
Kerr metric ⓘ
surface form:
Kerr spacetime
Minkowski space-time ⓘ
surface form:
Minkowski spacetime
Reissner–Nordström metric ⓘ
surface form:
Reissner–Nordström spacetime
Schwarzschild black hole ⓘ
surface form:
Schwarzschild spacetime
anti-de Sitter space ⓘ
surface form:
anti-de Sitter spacetime
de Sitter spacetime ⓘ |
| basedOn | conformal compactification ⓘ |
| field | general relativity ⓘ |
| namedAfter |
Brandon Carter
ⓘ
Roger Penrose ⓘ |
| property |
angles of null directions are preserved
ⓘ
maps infinite spacetime regions to finite regions ⓘ preserves causal structure under conformal transformation ⓘ |
| relatedConcept |
Cauchy horizon
ⓘ
Penrose–Carter diagrams self-linksurface differs ⓘ
surface form:
Penrose diagram
causal structure of spacetime ⓘ conformal boundary ⓘ conformal transformation ⓘ event horizon ⓘ global structure of solutions to Einstein equations ⓘ null geodesic ⓘ spacelike geodesic ⓘ timelike geodesic ⓘ |
| represents |
event horizons
ⓘ
light cones as 45-degree lines ⓘ null infinity ⓘ singularities ⓘ spacelike infinity ⓘ timelike infinity ⓘ |
| usedFor |
classifying causal boundaries of spacetime
ⓘ
compactifying infinity in spacetime diagrams ⓘ representing global causal structure of spacetime ⓘ studying black hole spacetimes ⓘ studying cosmological models ⓘ visualizing causal relationships between events ⓘ |
| usedIn |
black hole physics
ⓘ
cosmology ⓘ mathematical relativity ⓘ theoretical physics ⓘ |
| visualizes |
Cauchy surfaces
ⓘ
causal future of an event ⓘ causal past of an event ⓘ domains of dependence ⓘ maximally extended black hole solutions ⓘ wormhole-like connections in extended solutions ⓘ |
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: Penrose–Carter diagrams Description of subject: Penrose–Carter diagrams are spacetime diagrams used in general relativity that compactify infinity to depict the global causal structure of solutions like black holes and cosmological models.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Penrose diagram
this entity surface form:
Penrose diagrams
this entity surface form:
Penrose–Carter diagram
subject surface form:
Penrose–Carter diagram
this entity surface form:
Penrose diagram
subject surface form:
Penrose–Carter diagram
this entity surface form:
Penrose diagram
this entity surface form:
Penrose diagram
this entity surface form:
Penrose diagrams