[Physicist]

How do gravity waves escape black holes?

We need to be careful to distinguish between the gravitational field and gravitational waves.

The gravitational field is fixed to the black hole. In a nutshell, the gravitational field is the curvature of spacetime caused by the black hole. This curvature is defined everywhere in space, all the way up to the singularity at the center of the black hole; it is even defined inside the event horizon.

Gravitational waves are changes in the gravitational field. If a black hole is accelerated, obviously the field as it exists at some arbitrary point is going to change over time. This is perfectly analogous to the way electromagnetic waves are caused by the acceleration of electrical charges. If you move a charge around, the field associated with that charge will also be moved around. These changes in the field are propagated as a wave.

So in answer to your question, don't think of gravitational waves as radiating outward from a black hole like light from a bulb; rather, think of the gravitational field as being fixed to the black hole, with changes in the motion of the black hole thereby causing changes in the field.

[Barry Goldwater]

When charge moves the electric field is no longer purely coulombic, it now has a motional term (the field actually increases but is still non radiating). Does the gravity field have a corresponding increase toowhen the mass moves? If the mass is accelerated or changes density, it generates a radiation field. Is the radiation field transverse and does it have two components corresponding to electric and magnetic field?

All orbiting charge does not radiate, for example the electron orbiting the atom. What causes the earth to radiate or not radiate when it orbits the sun? What gives the phase quadrature components so it doesn't radiate? Or what are the in phase components to give the radiation? Gravity then must have a wavelength and phase in order to radiate.