Buscar
Mostrando ítems 61-70 de 403
Pure spinor formalism as an N=2 topological string
(Int School Advanced Studies, 2005-10-01)
Following suggestions of Nekrasov and Siegel, a non-minimal set of fields are added to the pure spinor formalism for the superstring. Twisted (c) over cap = 3 N = 2 generators are then constructed where the pure spinor ...
Pure spinor formalism as an N ≤ 2 topological string
(2005-10-01)
Following suggestions of Nekrasov and Siegel, a non-minimal set of fields are added to the pure spinor formalism for the superstring. Twisted ĉ ≤ 3 N ≤ 2 generators are then constructed where the pure spinor BRST operator ...
Higher-dimensional twistor transforms using pure spinors
(2004-12-01)
Hughston has shown that projective pure spinors can be used to construct massless solutions in higher dimensions, generalizing the four-dimensional twistor transform of Penrose. In any even (euclidean) dimension d = 2n, ...
One-loop superstring amplitude from integrals on pure spinors space
(Springer, 2009-12-01)
In the Type II superstring the 4-point function for massless NS-NS bosons at one-loop is well known [1, 14]. The overall constant factor in this amplitude is very important because it needs to satisfy the unitarity and ...
Dynamical twisting and the b ghost in the pure spinor formalism
(2013-07-26)
After adding an RNS-like fermionic vector ψ m to the pure spinor formalism, the non-minimal b ghost takes a simple form similar to the pure spinor BRST operator. The N=2 superconformal field theory generated by the b ghost ...
Covariant map between Ramond-Neveu-Schwarz and pure spinor formalisms for the superstring
(Springer, 2014-04-04)
A covariant map between the Ramond-Neveu-Schwarz (RNS) and pure spinor formalisms for the superstring is found which transforms the RNS and pure spinor BRST operators into each other. The key ingredient is a dynamical ...
Pure spinor partition function using Padé approximants
(Int School Advanced Studies, 2008-07-01)
In a recent paper, the partition function (character) of ten-dimensional pure spinor worldsheet variables was calculated explicitly up to the fifth mass-level. In this letter, we propose a novel application of Padé ...
Cohomology in the pure spinor formalism for the superstring
(2000-12-01)
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 new formalism is easily quantized with a ...
Lorentz invariance of the pure spinor BRST cohomology for the superstring
(Elsevier B.V., 2001-08-16)
In a previous Letter. The BRST cohomology in the pure spinor formalism of the superstring was shown to coincide with the light-cone Green-Schwarz spectrum by using an SO(8) parameterization of the pure spinor. In this ...
Some mathematical aspects and scattering amplitudes in the pure spinor formalism
(Universidade Estadual Paulista (Unesp), 2011-11-10)
Primeiro vamos dar uma breve revisão sobre o artigo de Nekrasov “ Lectures on curved beta-gamma systems, pure spinors, and anomalies”, a fim de mostrar que o formalismo de espinor puro é livre de anomalia quando a origem é ...