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Psi4AlphaSubcritical Brill Wave, Amplitude 4. The actual computation domain was an octant of the full 3D space, which is sufficient due to the octant symmetry of the spacetime. Shown is the upper quadrant of the computation domain, displaying the Re{Below the quadrant cube the lapse function (~proper time) along the equatorial plane is shown as height field. Red values indicate 1.0, blue/violett values indicate the time approaching zero. A lapse function near zero is an indication for a strong graviational field, or even a black hole.
Just after starting the evolution, the lapse functions sinks to
small values at the origin, indicating the strongness of the gravitational
field bound in the Brill Wave. However the gravitational field is not
strong enough to hold itself, so it `bounces back' and a large pulse
of gravitational energy is leaving the bounding box after some time.
This is visible as a dense pulse of the Re{ The final state is empty space in the shown data quadrant and a lapse function at 1.0 (red plane).
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