https://doi.org/10.1140/epjc/s10052-025-14249-z
Regular Article - Theoretical Physics
DDF amplitudes are lightcone amplitudes and the naturalness of Mandelstam maps
Dipartimento di Fisica, Università di Torino, and I.N.F.N., Sezione di Torino, Via P. Giuria 1, 10125, Turin, Italy
Received:
9
January
2025
Accepted:
29
April
2025
Published online:
24
June
2025
We show that on-shell DDF amplitudes are on-shell lightcone amplitudes and that Mandelstam maps emerge naturally with a precise normalization, and are intrinsic to the DDF states. Off-shell DDF and Mandelstam amplitudes à la Kaku–Kikkawa differ. In the process, we give a very explicit formula for the conformal transformation of a generic vertex in the form of a compact generating function for free theories.
© The Author(s) 2025
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