 Arnowitt was also known for his work (with Ali Chamseddine and Pran Nath) which developed the theory of supergravity grand unification (with gravity mediated breaking).This work allowed for the unification of the three forces of microscopic physics at a very high mass scale (a result subsequently indirectly verified at the CERN LEP accelerator).The simplest version, called mSUGRA, is now commonly used to search for new physics at high energy accelerators.