Abstract
We compute the scalar curvature of seven-dimensional G 2-manifolds admitting a G 2-connection with totally skew-symmetric torsion. We prove the formula for the general solution of the Killing spinor equation and express the Riemannian scalar curvature of the solution in terms of the dilation function and the NS 3-form field. In dimension n=7 the dilation function involved in the second fermionic string equation has an interpretation as a conformal change of the underlying integrable G 2-structure into a cocalibrated one of pure type W 3.
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