Examinando por Autor "Chandia, O."
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Ítem A note on the classical BRST symmetry of the pure spinor string in a curved background(Scuola Internazionale Superiore di Studi Avanzati (SISSA) [Associate Organisation] Springer Verlag [Commercial Publisher], 2006-07) Chandia, O.The classical pure spinor version of the heterotic superstring in a supergravity and super Yang-Mills background is considered. We obtain the BRST transformations of the world-sheet fields. They are consistent with the constraints obtained from the nilpotence of the BSRT charge and the holomorphicity of the BRST current.Ítem A superfield realization of the integrated vertex operator in an AdS 5 × S 5 background(Springer Verlag, 2017-10) Chandia, O.; Vallilo, B.C.The integrated massless vertex operator in an AdS 5 × S 5 background in the pure spinor formalism is constructed in terms of superfields.Ítem D = 4 pure spinor superstring and N = 2 strings(Scuola Internazionale Superiore di Studi Avanzati (SISSA) [Associate Organisation] Springer Verlag [Commercial Publisher], 2005-10) Chandia, O.We study the compactification of the pure spinor superstring down to four dimensions. We find that the compactified string is described by a conformal invariant system for both the four dimensional and for the compact six dimensional variables. The four dimensional sector is found to be invariant under a non-critical N ≤ 2 superconformal transformations.Ítem One-loop conformal invariance of the type II pure spinor superstring in a curved background(Scuola Internazionale Superiore di Studi Avanzati (SISSA) [Associate Organisation] Springer Verlag [Commercial Publisher], 2007-01) Bedoya, O.; Chandia, O.We compute the one-loop beta functions for the Type II superstring using the pure spinor formalism in a generic supergravity background. It is known that the classical pure spinor BRST symmetry puts the background fields on-shell. In this paper we show that the one-loop beta functions vanish as a consequence of the classical BRST symmetry of the action.Ítem Relating the b ghost and the vertex operators of the pure spinor superstring(Springer Science and Business Media Deutschland GmbH, 2021-03) Chandia, O.; Vallilo, B.C.The OPE between the composite b ghost and the unintegrated vertex operator for massless states of the pure spinor superstring is computed and shown to reproduce the structure of the bosonic string result. The double pole vanishes in the Lorenz gauge and the single pole is shown to be equal to the corresponding integrated vertex operator. © 2021, The Author(s).Ítem Vertex operators for the plane wave pure spinor string(Springer Verlag, 2018-10) Chandia, O.; Vallilo, B.C.In this work we give an explicit construction for the vertex operators of massless states in the pure spinor superstring in a plane wave background. The construction is based on the observation that the full action can be divided in two parts, where the simpler one is based on a smaller coset and closely resembles the gauge fixed Green-Schwarz action. © 2018, The Author(s).