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- Nathan Berkovits
- 2000

Using pure spinors, the superstring is covariantly quantized. For the first time, mass-less vertex operators are constructed and scattering amplitudes are computed in a manifestly ten-dimensionalâ€¦ (More)

- Nathan Berkovits
- 1995

We show how to make a topological string theory starting from an N = 4 super-conformal theory. The critical dimension for this theory isË†c = 2 (c = 6). It is shown that superstrings (in both the RNSâ€¦ (More)

- Nathan Berkovits
- 1995

Using the topological techniques developed in an earlier paper with Vafa, a field theory action is constructed for any open string with critical N=2 worldsheet superconformal invariance. Instead ofâ€¦ (More)

- Nathan Berkovits
- 1999

We review a formalism of superstring quantization with manifest six-dimensional spacetime supersymmetry, and apply it to AdS 3 Ã— S 3 backgrounds with Ramond-Ramond flux. The resulting description isâ€¦ (More)

It has been conjectured that at the stationary point of the tachyon potential for the Dbrane-anti-D-brane pair or for the non-BPS D-brane of superstring theories, the negative energy density cancelsâ€¦ (More)

- Nathan Berkovits
- 2004

A ten-dimensional super-PoincarÃ© covariant formalism for the superstring was recently developed which involves a BRST operator constructed from superspace matter variables and a pure spinor ghostâ€¦ (More)

- Nathan Berkovits
- 2002

It has recently been shown that the ten-dimensional superstring can be quantized using the BRST operator Q = âˆ® Î»dÎ± where Î» Î± is a pure spinor satisfying Î»Î³Î» = 0 and dÎ± is the fermionic supersymmetricâ€¦ (More)

- Nathan Berkovits
- 2005

Following suggestions of Nekrasov and Siegel, a non-minimal set of fields are added to the pure spinor formalism for the superstring. TwistedË†c = 3 N=2 generators are then constructed where the pureâ€¦ (More)

- Nathan Berkovits, M. Bershadsky, Tamas Hauer, Slava Zhukov, Barton Zwiebach
- 1999

We quantize the superstring on the AdS2 Ã— S background with Ramond-Ramond flux using a PSU(1, 1|2)/U(1)Ã— U(1) sigma model with a WZ term. One-loop conformal invariance of the model is guaranteed by aâ€¦ (More)

- Nathan Berkovits
- 2000

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 projected states of theâ€¦ (More)