> Uhmm, he’s working on quantum gravity too. Just a different approach. The same applies to loop quantum gravity. String theory isn't a quantum theory of gravi

> Uhmm, he’s working on quantum gravity too. Just a different approach. The same applies to loop quantum gravity. String theory isn't a quantum theory of gravity in the same way that loop quantum gravity (LQG) is, LQG is background independent. String theory assumes there is a flat background spacetime already present and perturbatively builds off of that. LQG doesn't make this assumption and tries to create spacetime from scratch. LQG did make some testable predictions, as has string theory in recent years. One was regarding the smallest units of area and volume that might have been seen in light scattering in cosmic ray or gamma-ray burst experiments[1]. Another suggesting evaporating black holes could be used to probe LQG [2]. String theory proposed supersymmetry, where each fundamental particle had a supersymmetric partner. Electron => selectron, quark => squark, etc. But none of these proposals have panned out as yet. Thus far supersymmetry has not been found and LQG has not been able to recover general relativity in a classical limit. > The many-worlds interpretation of quantum mechanics is just that, an interpretation. It doesn’t make any measurable difference from any other interpretation. In the last couple years, many-worlds researchers have come up with some potentially measurable consequences [3]. [1] https://www.edge.org/conversation/lee_smolin-loop-quantum-gravity-lee-smolin https://www.edge.org/conversation/lee_smolin-loop-quantum-gr... [2] http://dx.doi.org/10.1103/PhysRevLett.107.251301 http://dx.doi.org/10.1103/PhysRevLett.107.251301 [3] http://journals.aps.org/prx/abstract/10.1103/PhysRevX.4.041013 http://journals.aps.org/prx/abstract/10.1103/PhysRevX.4.0410...