y
Frank Wilczek
Institute for Advanced Study, School of Natural Science, Olden Lane, Princeton, NJ 08540
I discuss the general principles underlying quantum eld theory, and attempt to identify its
most profound consequences. The deep est of these consequences result from the in nite number of
degrees of freedom invoked to implement lo cality.Imention a few of its most striking successes,
b oth achieved and prosp ective. Possible limitation s of quantum eld theory are viewed in the light
of its history.
I. SURVEY
Quantum eld theory is the framework in which the regnant theories of the electroweak and strong interactions,
which together form the Standard Mo del, are formulated. Quantum electro dynamics (QED), b esides providing a com-
plete foundation for atomic physics and chemistry, has supp orted calculations of physical quantities with unparalleled
precision. The exp erimentally measured value of the magnetic dip ole moment of the muon,