Optical scalars
id:
optical-scalars-298-12344193
title:
Optical scalars
text:
In general relativity, optical scalars refer to a set of three scalar functions { θ ^ (expansion), σ ^ (shear) and ω ^ (twist/rotation/vorticity) } describing the propagation of a geodesic null congruence. In fact, these three scalars { θ ^ , σ ^ , ω ^ } can be defined for both timelike and null geodesic congruences in an identical spirit, but they are called "optical scalars" only for the null case. Also, it is their tensorial predecessors { θ ^ h ^ a b , σ ^ a b , ω ^ a b } that are adopted in
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https://en.wikipedia.org/wiki/Optical_scalars
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date modified:
2021-08-05T18:00:58Z
main entity:
{"identifier":"Q7098894","url":"https://www.wikidata.org/entity/Q7098894"}
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