Classical/Quantum Duality

Details Classical/Quantum Duality Classical/Quantum Duality

1994-10-27

arxiv.org/abs/hep-th/9410210v2

Physics

High Energy Physics

High Energy Physics - Theory

5 pages latex, NI-94-016, Typographical errors corrected

Scientific paper

String theory requires two kinds of loop expansion: classical $(\alpha')$ worldsheet loops with expansion parameter $$ where $T$ is a modulus field, and quantum $(\hbar)$ spacetime loops with expansion parameter $$ where $S$ is the dilaton field. Four-dimensional string/string duality (a corollary of ten-dimensional string/fivebrane duality) interchanges the roles of $S$ and $T$ and hence interchanges classical and quantum.