Examples
Null dust solutions include two large and important families of exact solutions:
- pp-wave spacetimes (which model generalizations of the plane waves familiar from electromagnetism),
- Robinson–Trautman null dusts (which model radiation expanding from a radiating object).
The pp-waves include the gravitational plane waves and the monochromatic electromagnetic plane wave. A specific example of considerable interest is
- the Bonnor beam, an exact solution modeling an infinitely long beam of light surrounded by a vacuum region.
Robinson–Trautman null dusts include the Kinnersley–Walker photon rocket solutions, which include the Vaidya null dust, which includes the Schwarzschild vacuum.
Read more about this topic: Null Dust Solution
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