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Superstring Vertex Operators in an AdS_5 x S^5 Background
Nathan Berkovits, Osvaldo Chandia
A quantizable action has recently been proposed for the superstring in an AdS_5 x S^5 background with Ramond-Ramond flux. In this paper, we construct physical vertex operators corr…
Covariant Quantization of the Superstring
Nathan Berkovits
After reviewing the Green-Schwarz superstring using the approach of Siegel, the superstring is covariantly quantized by constructing a BRST operator from the fermionic constraints…
Cohomology in the Pure Spinor Formalism for the Superstring
Nathan Berkovits
A manifestly super-Poincaré covariant formalism for the superstring has recently been constructed using a pure spinor variable. Unlike the covariant Green-Schwarz formalism, this n…
Consistency of Super-Poincare Covariant Superstring Tree Amplitudes
Nathan Berkovits, Brenno Carlini Vallilo
Using pure spinors, the superstring was recently quantized in a manifestly ten-dimensional super-Poincaré covariant manner and a covariant prescription was given for tree-level sca…
Tachyon Condensation in Superstring Field Theory
Nathan Berkovits, Ashoke Sen, Barton Zwiebach
It has been conjectured that at the stationary point of the tachyon potential for the D-brane-anti-D-brane pair or for the non-BPS D-brane of superstring theories, the negative ene…
The Tachyon Potential in Open Neveu-Schwarz String Field Theory
Nathan Berkovits
A classical action for open superstring field theory has been proposed which does not suffer from contact term problems. After generalizing this action to include the non-GSO proje…