A single complex optical seed built from expansion and twist organizes stationary Kerr-Schild geometries, reconstructs the congruence, and encodes the zeroth-copy data that generates both the gravitational profile and the single-copy gauge field.
C´ aceres, B
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The Kerr-Schild and twistorial double copies are equivalent for self-dual vacuum Kerr-Schild spacetimes.
GEM with restricted gauge symmetry yields a propagator resembling the linearized GR graviton propagator, couples to matter via energy-momentum tensors, and satisfies Ward identities under consistent gauge fixing.
citing papers explorer
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Untwisting the double copy: the zeroth copy as an optical seed
A single complex optical seed built from expansion and twist organizes stationary Kerr-Schild geometries, reconstructs the congruence, and encodes the zeroth-copy data that generates both the gravitational profile and the single-copy gauge field.
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The Penrose Transform and the Kerr-Schild double copy
The Kerr-Schild and twistorial double copies are equivalent for self-dual vacuum Kerr-Schild spacetimes.
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Diffeomorphism-Like Symmetry in Gravitoelectromagnetism
GEM with restricted gauge symmetry yields a propagator resembling the linearized GR graviton propagator, couples to matter via energy-momentum tensors, and satisfies Ward identities under consistent gauge fixing.