On Projections to the Pure Spinor Space

Details On Projections to the Pure Spinor Space On Projections to the Pure Spinor Space

2011-09-13

arxiv.org/abs/1109.2848v3

JHEP12(2011)089

Physics

High Energy Physics

High Energy Physics - Theory

35+32 pages (main part+ appendix). Changes from version 2 to version 3: Reference [11] added. Equation numbers include now the

Scientific paper

10.1007/JHEP12(2011)089

A family of covariant non-linear projections from the space of SO(10) Weyl spinors onto the space of pure SO(10) Weyl spinors is presented. The Jacobian matrices of these projections are related to a linear projector which was previously discussed in pure spinor string literature and which maps the antighost to its gauge invariant part. Only one representative of the family leads to a Hermitian Jacobian matrix and can itself be derived from a scalar potential. Comments on the SO(1,9) case are given as well as on the non-covariant version of the projection map. The insight is applied to the ghost action of pure spinor string theory, where the constraints on the fields can be removed using the projection, while introducing new gauge symmetries. This opens the possibility of choosing different gauges which might help to clarify the origin of the pure spinor ghosts. Also the measure of the pure spinor space is discussed from the projection point of view. The appendix contains the discussion of a toy model which served as a guideline for the pure spinor case.

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