Harmonic Superstring and Covariant Quantization of the Green-Schwarz Superstring.

摘要

Based on our recent work, we describe a new generalized model of space-time supersymmetric strings - the harmonic superstring. It has the same physical content as the original Green-Schwarz (GS) superstring but it is defined on an enlarged superspace: the D=10 harmonic superspace and incorporates additional fermionic string coordinates. The main feature of the harmonic superstring model is that it contains covariant and irreducible first-class constraints only. This allows for a straightforward manifestly super-Poincare covariant Batalin-Fradkin-Vilkoviski (BFV) - Becchi-Rouet-Stora-Tyutin (BRST) quantization. The BRST charge has a remarkably simple form and the corresponding BFV Hamiltonian exhibits manifest Parisi-Sourlas OSp(1,1/2) symmetry. In a particular Lorentz-covariant gauge, we find the covariant vertex operators for the emission of the massless states which closely resemble the covariant ''classical'' expressions previously guessed by Green and Schwarz. (author). 27 refs. (Atomindex citation 19:069606)