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searching for Null hypersurface 2 found (6 total)

Bondi–Metzner–Sachs group (2,293 words) [view diff] exact match in snippet view article find links to article

along which the gravitational waves traveled. The null rays form a null hypersurface, defined by the retarded time u = constant {\displaystyle u={\text{constant}}}

Optical scalars (2,874 words) [view diff] exact match in snippet view article find links to article

{\omega }}_{ab}\;.} For a geodesic null congruence restricted on a null hypersurface, we have ( 20 ) k c ∇ c θ = θ ^ , λ = − 1 2 θ ^ 2 − σ ^ a b σ ^ a