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- Photon_surface abstract "Photon sphere (definition):A photon sphere of a static spherically symmetric metric is a timelike hypersurface if the deflection angle of a light ray with the closest distance of approach diverges as For a general static spherically symmetric metricthe photon sphere equation is:The concept of a photon sphere in a static spherically metric was generalized to a photon surface of any metric.Photon surface (definition) : A photon surface of (M,g) is an immersed, nowhere spacelike hypersurface S of (M, g) such that, for every point p∈S and every null vector k∈TpS, there exists a null geodesic (-ε,ε)→M of (M,g) such that (0)=k, |γ|⊂S.Both definitions give the same result for a general static spherically symmetric metric.Theorem:Subject to an energy condition, a black hole in any spherically symmetric spacetime must be surrounded by a photon sphere. Conversely, subject to an energy condition, any photon sphere must cover more than a certain amount of matter, a black hole, or a naked singularity.".
- Photon_surface wikiPageID "28473945".
- Photon_surface wikiPageRevisionID "542667402".
- Photon_surface hasPhotoCollection Photon_surface.
- Photon_surface subject Category:Black_holes.
- Photon_surface subject Category:General_relativity.
- Photon_surface type BlackHole109223177.
- Photon_surface type BlackHoles.
- Photon_surface type Location100027167.
- Photon_surface type Object100002684.
- Photon_surface type PhysicalEntity100001930.
- Photon_surface type Region108630039.
- Photon_surface type YagoGeoEntity.
- Photon_surface type YagoLegalActorGeo.
- Photon_surface type YagoPermanentlyLocatedEntity.
- Photon_surface comment "Photon sphere (definition):A photon sphere of a static spherically symmetric metric is a timelike hypersurface if the deflection angle of a light ray with the closest distance of approach diverges as For a general static spherically symmetric metricthe photon sphere equation is:The concept of a photon sphere in a static spherically metric was generalized to a photon surface of any metric.Photon surface (definition) : A photon surface of (M,g) is an immersed, nowhere spacelike hypersurface S of (M, g) such that, for every point p∈S and every null vector k∈TpS, there exists a null geodesic (-ε,ε)→M of (M,g) such that (0)=k, |γ|⊂S.Both definitions give the same result for a general static spherically symmetric metric.Theorem:Subject to an energy condition, a black hole in any spherically symmetric spacetime must be surrounded by a photon sphere. ".
- Photon_surface label "Photon surface".
- Photon_surface sameAs m.0crd3d9.
- Photon_surface sameAs Q7187862.
- Photon_surface sameAs Q7187862.
- Photon_surface sameAs Photon_surface.
- Photon_surface wasDerivedFrom Photon_surface?oldid=542667402.
- Photon_surface isPrimaryTopicOf Photon_surface.