The String Measure and Spectral Flow of Critical N=2 Strings
Sergei Ketov, Olaf Lechtenfeld
Abstract
The general structure of N=2 moduli space at arbitrary genus and instanton number is investigated. The N=2 NSR string measure is calculated, yielding picture- and U(1) ghost number-changing operator insertions. An explicit formula for the spectral flow operator acting on vertex operators is given, and its effect on N=2 string amplitudes is discussed.
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