硼钢的特性.pdf

arXiv:hep-th/9902178v1 24 Feb 1999
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1 Introduction
Superstring theory in ten dimensions is a critical N = 1 superconformal
theory. It can be quantized using a nilpotent BRST operator
1 1 1
Q = dz [c(T + T ) + γ(G + G )] (1)
2πi I m 2 g m 2 g
where [Tm, Gm] are the c = 15 N=1 superconformal generators and [Tg, Gg]
are the c = −15 N=1 superconformal generators constructed from a pair
of fermionic ghosts [b, c] and a pair of bosonic ghosts [β, γ]. Physical states
are described by vertex operators in the cohomology of Q and, in order to
construct vertex operators for the spacetime fermions, it is convenient to
fermionize th