The Radon transform on the Poincare disc shows that the SYK four-point boundary condition theta = 3 pi / 4 is the unique one compatible with the antipodal identification of kinematic de Sitter space.
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Radon Transforms and the SYK model
The Radon transform on the Poincare disc shows that the SYK four-point boundary condition theta = 3 pi / 4 is the unique one compatible with the antipodal identification of kinematic de Sitter space.