Publikace ÚTF

Effects of rotating gravitational waves

Bičák J.; Katz J.;Ledvinka T.; and Lynden-Bell D.

We study gravitational waves to first and second order in amplitude in vacuum asymptotically flat
spacetimes. The Einstein equations are solved to first order and these solutions are superposed to form a
time-symmetric ingoing and then outgoing pulse regular everywhere. The waves are assumed to have odd
parity and a nonvanishing angular momentum which keeps them away from the axis at all times. The
averaged energy of the waves is evaluated. The relevant Einstein equation is then solved to second order in
the amplitude. The influence of the angular momentum of the waves on the rotation of local inertial frames
with respect to the frames at great distances is analyzed. The rotation of the frames occurs even in the
region around the origin where spacetime is almost flat. The rotation is without time delay as it follows
from the constraint equation. The results are illustrated graphically for various values of the ‘‘harmonic
index m’’ corresponding to azimuthal rotation and the ‘‘harmonic index l’’ describing the latitudinal
rotation of the waves. The apparent motions of the fixed stars on the celestial sphere as seen through
rotating waves from the local inertial frame are calculated and displayed.
journal:Phys. Rev. D
pacs:04.30.-w, 04.20.Cv

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