Note that I'm pulling the above out of my ass, given how much I know about QED et al.
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WTF is the speed of gravity
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12-17-10 Mohamed Bouazizi NEVER FORGET
Stadtluft Macht Frei
Killing it is the new killing it
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Remember that we have no data points for quantum levels of gravitation (right?) so all you require is that on everyday scale at low velocity it reduces to Newt gravity...12-17-10 Mohamed Bouazizi NEVER FORGET
Stadtluft Macht Frei
Killing it is the new killing it
Ultima Ratio Regum
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Originally posted by Frogger
You can't describe gravity on a quantum scale? I'm pretty sure you can. What would the problem be? Just use QED, slap on coupling constant. Only problem is that when you hit large scales it breaks down, no?
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Nah, isn't QCD more complex just because they have evidence of it being more complex? Like the fact that there are a kajillion diferent colours of force carriers, etc.?
On everyday scale, grav. is quite simple...behaves exactly EM except weaker and there's no repulsion...12-17-10 Mohamed Bouazizi NEVER FORGET
Stadtluft Macht Frei
Killing it is the new killing it
Ultima Ratio Regum
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Originally posted by Ethelred
Isn't Quantum Chromo Dynamics more complex than QED? That would imply that a quantum theory of gravity would be more complex yet.
This introduces quite a few more complexities - for example, the gluon (the QCD force carrier) itself carries colour charge; the photon by contrast is neutral.
Gravity is probably based apon some more complex symmetry group. My money is on local supersymmetry, which is an extremely complicted group with fermionic generators. So quantum gravity will be quite different from (and quite a bit more complex than) QED.
But. Frogger, if you can write down a consistent theory of quantum gravity I am sure we would all be interested......
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