If you’ve been following the story of the “Landscape” over the past year or so you’d remember that its proponents felt that if it could predict anything it should be able to predict whether or not there will be supersymmetry at low energies. They had great hopes for making this prediction before 2008 when the LHC presumably will tell us whether there is supersymmetry at LHC energies.
Well, tonight one of the biggest proponents of this point of view, Michael Dine, has a new paper out with two co-authors, entitled Branches of the Landscape. In it they conclude:
“From all this, it appears that it is difficult, in principle, to decide whether or not the landscape predicts supersymmetry.”
So, many string theorists now seem to believe that:
1. String theory predicts a landscape of possible vacua.
2. Given the existence of such a landscape, one can’t predict whether or not there will be low-energy supersymmetry (or anything else either).
One wonders it these string theorists ever studied elementary logic and can draw the obvious conclusion from 1. and 2.