Fundamental Feynman

摘要

In 1981, shortly after I arrived in the physics department at the California Institute of Technology in Pasadena, I heard a strong voice resonating down the corridor: "Hey Schwarz, how many dimensions are you in today?" The answer then was 10; it was once 26; it is now 11. Richard Feynman, who was teasing John Schwarz -one of the founders of string theory - didn't think much of any theory in which it wasn't four, for that is all we observe.