Embedding vs. 6D twistors

Understand

We review the relation between the "embedding" formalism and spinorial projective space.

• The latter is more convenient when treating spin (and indispensable for supersymmetry), as it maintains manifest conformal symmetry while using 4-dimensional indices on fields/operators.
• It does this by solving all algebraic constraints using 6-dimensional (off-shell) twistors.
• In an added note we review the supersymmetric generalization, and give some new results for N=3.