Maar van het volgende stukje tekst:
.. begrijp ik niet goed wat er bedoeld wordt met:"Gravitational waves will be emitted by a rotating mass without axial symmetry during the formation of a black hole, but not after the event horizons have formed. If the body undergoing collapse has axial symmetry, there will be no gravitational radiation. The reason for this is that for gravitational radiation to occur, the quadrupole moment tensor of the mass distribution must have a non-zero second rate of change with respect to the time coordinate. This is not the case for a body with axial symmetry. Ultimately, the collapse of a non-charged rotating body, will produce the Kerr geometry. The Kerr geometry is stationary, meaning that there are coordinates in which the components of the metric tensor have no time dependence (for example the Kerr metric). No time dependence in the metric tensor means no gravitational radiation."
"the quadrupole moment tensor of the mass distribution must have a non-zero second rate of change with respect to the time coordinate."
Kan iemand mij dit uitleggen?
Bvd!!