mathwonk said:
looking back at the original post, i must agree. a lot of mathematicians i know are able to work on physics at least in collaboration with physicists, but i do not think the reverse is true. Very few of the physicists I have known seem able to make new contributions to math. one must leave aside remarkable exceptions like witten.
Speaking of this, I read only recently about the Riemann Hypothesis, and found this amazing non-technical

article. It mentions research on the primes (outdated, from year 2000 but still highly fascinating) and the apparent strong connection with chaotic quantum energy levels of 'heavy' atoms. This is soooo bizarre!
http://www.timetoeternity.com/time_space_light/prime_time.htm
"Connes decided to build a quantum state space out of the prime numbers. Of course, the primes are a bunch of isolated numbers, nothing like the smooth expanses of space in which we can measure things like angles and lengths. But mathematicians have invented some bizarrely twisted geometries that are based on the primes. In "5-adic" geometry, for example, numbers far apart (in the ordinary way) are pulled close together if they differ by 5, or 15, or 250—any multiple of 5. In the same way, 2-adic geometry pulls together all the even numbers.
To put all the primes in the mix, Connes constructed an infinite-dimensional space called the Adeles. In the first dimension, measurements are made with 2-adic geometry, in the second dimension with 3-adic geometry, in the third dimension with 5-adic geometry, and so on, to include all the prime numbers.
Last year Connes proved that his prime-based quantum system has energy levels corresponding to all the Riemann zeros that lie on the critical line. He will win the fame and the million-dollar prize if he can make one last step: prove that there aren't any extra zeros hanging around, unaccounted for by his energy levels."