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- Q16977871 subject Q6509408.
- Q16977871 subject Q8482188.
- Q16977871 abstract "In relativity, a null surface is a 3-surface whose normal vector is everywhere null (zero length with respect to the local Lorentz metric), but the vector is not identically zero. For example, light cones are null surfaces.An alternative characterization is that the tangent space at any point contains vectors that are all space-like except in one direction, in which vectors have a null "length". The metric applied to such a vector and any other vector in the tangent space (including the vector itself) is null. Another way of saying this is that the pullback of the metric onto the tangent space is degenerate.Physically, the tangent space at a given point on a null surface is space-like except that it contains one line corresponding to the world-line of a particle moving at the speed of light. For example, a light cone is a null hypersurface. Another example is a Killing horizon or the event horizon of a black hole.".
- Q16977871 wikiPageWikiLink Q1137903.
- Q16977871 wikiPageWikiLink Q1510587.
- Q16977871 wikiPageWikiLink Q181741.
- Q16977871 wikiPageWikiLink Q273176.
- Q16977871 wikiPageWikiLink Q43514.
- Q16977871 wikiPageWikiLink Q589.
- Q16977871 wikiPageWikiLink Q6407790.
- Q16977871 wikiPageWikiLink Q6509408.
- Q16977871 wikiPageWikiLink Q8482188.
- Q16977871 wikiPageWikiLink Q856292.
- Q16977871 wikiPageWikiLink Q909601.
- Q16977871 wikiPageWikiLink Q978505.
- Q16977871 comment "In relativity, a null surface is a 3-surface whose normal vector is everywhere null (zero length with respect to the local Lorentz metric), but the vector is not identically zero. For example, light cones are null surfaces.An alternative characterization is that the tangent space at any point contains vectors that are all space-like except in one direction, in which vectors have a null "length".".
- Q16977871 label "Null hypersurface".