Why does gravitational radiation produce vorticity?
arXiv:gr-qc/0703125 · doi:10.1088/0264-9381/24/10/010
Abstract
We calculate the vorticity of world--lines of observers at rest in a Bondi--Sachs frame, produced by gravitational radiation, in a general Sachs metric. We claim that such an effect is related to the super--Poynting vector, in a similar way as the existence of the electromagnetic Poynting vector is related to the vorticity in stationary electrovacum spacetimes.
9 pages; to appear in Classical and Quantum Gravity