R^4, purified

Details R^4, purified R^4, purified

2006-03-21

arxiv.org/abs/hep-th/0603165v2

Class.Quant.Grav.23:4753-4780,2006

Physics

High Energy Physics

High Energy Physics - Theory

32 pages. v2: minor corrections in the text; references added, including references to early pioneering work on pure spinors

Scientific paper

10.1088/0264-9381/23/14/012

We derive, using the pure-spinor formalism, the complete -- including the fermions -- four-point effective action of both type II superstrings to all orders in $\alpha'$, at tree level in string loops. We find that, in the quartic-field approximation, the supergravity Lagrangian can be thought of as the tensor product, in a suitable sense, of two copies of the superYang-Mills Lagrangian in ten dimensions. The NS-NS three-form enters the supergravity Lagrangian through a modified connection with torsion. As a byproduct, we derive the complete, i.e. to all orders in the $\theta$-expansion, closed-string vertex operator in a flat target-space background.

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