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Dear Peter,
I'm going to need a minimum of five lasers of different wavelengths. This is why. What happens to the photons of a laser when the beam is shined straight into a a blackhole? The photons blue shift. What does that mean? That means that every photon is undergoing:
1. an increase in frequency,
2. an increase in energy and,
3. an increase in momentum.
Why? Because the beam is experiencing a gravitational force. Call it conjecture, but I suspect that if I can duplicate the frequency profile of a laser falling into a black hole (without the black hole), that I can reproduce the associated gravity field. It's a guess and a hunch. It deserves an experiment to test it.
I agree with you Peter; space is not nothing.
As for shadows traveling FTL, I'm concerned that shadows make it possible to signal FTL? Photons are the fastest particles that we've encountered.
P:"I'm sure I'm not a genius, and James has now got it, (we'll be in double figures soon!) so it's only preconditioning with nonsense and lack of dynamic conceptualisation skills that prevents you from seeing it."
If we disagree about things like c+v, I certainly don't want to be a troglodyte about it. You are free to disagree with me and still be brilliant and open minded. We can disagree without one of us being wrong. Your c+v approach looks more like a frame dragging variation. Isn't that what the Sagnac effect comes down to? However, I'm assuming a constant unmoving frame in which relativity, as it's currently understood, is valid.
Maybe the elephant in the room is like space; it's real, but it's invisible and not directly detectable.