Sir Roger Penrose calls string theory a "fashion," quantum mechanics "faith," and cosmic inflation a "fantasy." Coming from an armchair theorist, these declarations might be dismissed. But Penrose is a well-respected physicist who co-authored a seminal paper on black holes with Stephen Hawking. What's wrong with modern physics—and could alternative theories explain our observations of the universe?He has his own speculative theories, such as the BICEP2 data not being evidence of inflation or gravity waves, but of magnetic fields in a previous universe before the big bang.
A lot of people are skeptical about string theory and inflation models. He thinks that quantum mechanics is incomplete because we do not understand wave function collapse.
He is one of the leading mathematical physicists alive today, and his ideas should be taken seriously.