This may help:How i can see the right lorentz invariance in lqg?
Most importantly, LQG makes here a prediction, thus becomes testable and finally, deserves the status of a scientific theory !Shouldn't this then lead one to the conclusion, that LQG is dead?
What is the prediction for the scale of Lorentz violations?Most importantly, LQG makes here a prediction, thus becomes testable and finally, deserves the status of a scientific theory !
As far as I know, there is no agreement in the present state of the theory. On needs to construct specific low energy models. There has been some claims by Smolin and other enthusiastic people. I meant to emphasize that one should not conclude the theory is "dead" but on the contrary that it is one way it becomes "alive" !What is the prediction for the scale of Lorentz violations?
So, the testability of the theory is highly model dependent? That is, there may be a number of possibilities?As far as I know, there is no agreement in the present state of the theory. On needs to construct specific low energy models.
In the present state of development, yes, I think so.So, the testability of the theory is highly model dependent?
Yes, and in fact if I remember correctly, Rovelli in his book gives arguments why, beyond naive expectations, Lorentz invariance might even still hold down to the quantum of length.Is it possible that the Lorentz violating effects only occur at the Planck scale?
So, how is this different from string theory?In the present state of development, yes, I think so.
So, the predictions might only be testable in principle? Again, how is this different from string theory?Yes, and in fact if I remember correctly, Rovelli in his book gives arguments why, beyond naive expectations, Lorentz invariance might even still hold down to the quantum of length.
Then quantum field theory, or more precisely, the standard way of quantization of fields, is Lorentz invariant. Even quantum gravity can be quantized in this way, and then quantum gravity is Lorentz invariant too. However, this method of quantization of gravity has other problems (non-renormalizability, background dependence, ...), which is why one searches for other approaches, like LQG and string theory, which solve some problems but cause some new ones.i would like remember that the quantum field theory is model dependent too. and then?
I don't think this is different from string theory.So, how is this different from string theory?