Multiloop superstring amplitudes from non-minimal pure spinor formalism

• Autor(a) principal: Berkovits, Nathan
• Data de Publicação: 2006
• Outros Autores: Nekrasov, Nikita
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://arxiv.org/abs/hep-th/0609012; http://hdl.handle.net/11449/32234
• topic: BRST symmetry; superstrings and heterotic strings

Using the non-minimal version of the pure spinor formalism, manifestly super-Poincare covariant superstring scattering amplitudes can be computed as in topological string theory without the need of picture-changing operators. The only subtlety comes from regularizing the functional integral over the pure spinor ghosts. In this paper, it is shown how to regularize this functional integral in a BRST-invariant manner, allowing the computation of arbitrary multiloop amplitudes. The regularization method simplifies for scattering amplitudes which contribute to ten-dimensional F-terms, i.e. terms in the ten-dimensional superspace action which do not involve integration over the maximum number of theta's.