
Basic Superstring Theory Concepts
A
string's spacetime history is described by the functions X^{m}(s,t),
which map the string's twodimensional world sheet coordinates (s,t)
into the spacetime coordinates X^{m}.
Classical
string theory dynamics is described by a twodimensional quantum
theory.
L_{st}
is the fundamental string scale which is about 10^{32} centimeters.
It is also the expansion parameter of this twodimensional worldsheet
theory. Fortunately, this twodimensional quantum
theory is renormalizable.

