Physics and mathematics seem to be in ‘pre-established harmony’, a phrase that has long been popular with physicists and mathematicians working at the subjects’ interface. Greg Moore, based at Rutgers University, has discovered many surprising new relationships between quantum field theories and the string framework and concepts in contemporary mathematics. In this interview, he eloquently describes examples of this and explains why he is promoting the notion of ‘physical mathematics’, a discipline that he believes is now well established, with a bright future. This is one of a number of interviews given by world-class experts to Graham on the themes he explores in his new book The Universe Speaks in Numbers. For information regarding your data privacy, visit acast.com/privacy