Albert Einstein was a pioneer of relativity and has actually made major contributions to early quantum mechanics, too. (And he also encouraged people to think about entanglement etc.) However, he didn’t really accept quantum mechanics because he has never understood it. Paul Dirac, a big shot from a newer generation, understood relativity as well as quantum mechanics (he was a major co-father of it) but he has never accepted renormalization. Of course, this theme gets repeated all the time. Richard Feynman was a big shot guy from another younger generation who understood and accepted relativity, quantum mechanics as well as renormalization but he was already too old to understand and accept string theory.

— Regularization and renormalization

— Lubos Motl

2013.06.03 Monday ACHK