aviel wrote:Joseph Stalin wrote:What do you mean by falsifiable?
We can, at least with better technology, do experiments to test whether or not it is true.String theory is not experimentally falsifiable with any conceivable technology, but then no theory which deals with so high energies is.
String theory is falsifiable in principle. For instance, I mentioned the entropy calculations of a certain black hole. This is a prediction.
I may be misunderstanding the issue, but isn't that a post-diction? Did we not already know it and string theory uncovered it? Also, I heard that quantum loop gravity was at least falsifiable. Is that untrue?
Which part is a post-diction? Do you mean reduction of string theory to know theories? Well, it is basic consistency check. It is a very important feature of the theory. If you want something really new string theory predicts supersymmetry.
Loop quantum gravity fails to reduce to know theories. It has no connection to particle physics. It's main prediction is Lorentz violation at high energies. If I recall correctly Lorentz violation up to almost Planck scales has been experimentally falsified recently by some gamma ray burst observations. LQG is looking worse after this.
This experiment has also shown string theory's prediction that Lorentz invariance holds at all energies to be correct.