Tolman surface brightness test
E145218
The Tolman surface brightness test is an observational cosmology method that checks whether the universe is expanding by examining how the surface brightness of distant galaxies diminishes with redshift.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Tolman surface brightness test canonical | 1 |
| Tolman surface brightness test in cosmology | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1263728 — 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.
Target entity: Tolman surface brightness test Context triple: [Richard C. Tolman, notableConcept, Tolman surface brightness test]
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A.
On the Curvature of Space
"On the Curvature of Space" is a pioneering 1922 paper by Alexander Friedmann that introduced non-static, expanding-universe solutions to Einstein’s field equations, laying the theoretical foundation for modern cosmology.
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B.
Schwarzschild–Milne equations
The Schwarzschild–Milne equations are fundamental integro-differential equations in radiative transfer theory that describe the propagation and scattering of radiation through a plane-parallel, absorbing and emitting medium.
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C.
Baade’s Window
Baade’s Window is a relatively dust-free region of the Milky Way’s central bulge that provides a clear observational “window” for studying the galaxy’s core and its stellar populations.
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D.
Dall–Kirkham telescope design
The Dall–Kirkham telescope design is a type of reflecting telescope that uses an elliptical primary mirror and a spherical secondary mirror to provide good on-axis image quality with relatively simple, easy-to-manufacture optics.
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E.
The Restless Universe
The Restless Universe is a popular science book by physicist Max Born that explains modern physics and quantum theory to a general audience in clear, accessible language.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
Target entity: Tolman surface brightness test Target entity description: The Tolman surface brightness test is an observational cosmology method that checks whether the universe is expanding by examining how the surface brightness of distant galaxies diminishes with redshift.
-
A.
On the Curvature of Space
"On the Curvature of Space" is a pioneering 1922 paper by Alexander Friedmann that introduced non-static, expanding-universe solutions to Einstein’s field equations, laying the theoretical foundation for modern cosmology.
-
B.
Schwarzschild–Milne equations
The Schwarzschild–Milne equations are fundamental integro-differential equations in radiative transfer theory that describe the propagation and scattering of radiation through a plane-parallel, absorbing and emitting medium.
-
C.
Baade’s Window
Baade’s Window is a relatively dust-free region of the Milky Way’s central bulge that provides a clear observational “window” for studying the galaxy’s core and its stellar populations.
-
D.
Dall–Kirkham telescope design
The Dall–Kirkham telescope design is a type of reflecting telescope that uses an elliptical primary mirror and a spherical secondary mirror to provide good on-axis image quality with relatively simple, easy-to-manufacture optics.
-
E.
The Restless Universe
The Restless Universe is a popular science book by physicist Max Born that explains modern physics and quantum theory to a general audience in clear, accessible language.
- F. None of above. chosen
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf |
cosmological test
ⓘ
observational cosmology method ⓘ |
| affectedBy |
K-corrections
ⓘ
cosmological dimming ⓘ galaxy evolution ⓘ selection effects ⓘ |
| appliedTo |
elliptical galaxies
ⓘ
galaxy clusters ⓘ |
| assumes | conservation of surface brightness in Euclidean static space ⓘ |
| basedOn |
FLRW cosmological models
ⓘ
surface form:
Friedmann–Lemaître–Robertson–Walker metric
relativistic cosmology ⓘ |
| category |
cosmological observations
ⓘ
tests of the expanding universe ⓘ |
| compares | observed surface brightness–redshift relation with theoretical predictions ⓘ |
| contrastsWith | static universe models ⓘ |
| developedBy | Richard C. Tolman ⓘ |
| distinguishes | expanding universe from static tired-light models ⓘ |
| field |
astrophysics
ⓘ
cosmology ⓘ |
| hasConsequence | observed dimming consistent with expansion rather than static space ⓘ |
| involves |
angular diameter distance
ⓘ
luminosity distance ⓘ photon energy redshift ⓘ time dilation of photon arrival rates ⓘ |
| measures | change of surface brightness with redshift ⓘ |
| namedAfter | Richard C. Tolman ⓘ |
| predicts | (1+z)^-4 dependence of surface brightness in an expanding universe ⓘ |
| proposedIn | 1930s ⓘ |
| purpose | test whether the universe is expanding ⓘ |
| relatedTo |
Etherington reciprocity theorem
ⓘ
Lemaître–Hubble law ⓘ
surface form:
Hubble–Lemaître law
Tolman test for the reality of the expansion of the universe ⓘ cosmic distance ladder ⓘ cosmic expansion ⓘ |
| requires |
photometric measurements of galaxies
ⓘ
redshift measurements of galaxies ⓘ |
| supports | standard expanding universe interpretation of redshifts ⓘ |
| tests |
cosmological models
ⓘ
reality of cosmic expansion ⓘ |
| usedBy | observational cosmologists ⓘ |
| usedFor | consistency checks of cosmological parameters ⓘ |
| uses |
redshift of distant galaxies
ⓘ
surface brightness of galaxies ⓘ |
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.
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.
Subject: Tolman surface brightness test Description of subject: The Tolman surface brightness test is an observational cosmology method that checks whether the universe is expanding by examining how the surface brightness of distant galaxies diminishes with redshift.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.