RT Journal Article T1 On the de Sitter spectra A1 Aguirre Dabán, Eduardo A1 Esteve, A. AB The principal series of the unitary irreducible representations of the noncompact symplectic groupSp 1,1 are constructed using a generalization to the quaternionic field of Grave’s paper onU p,q . The spectra of these representations are explicitly calculated. SinceSp 1,1 is the covering of the de Sitter groupO 4,1, its invariants are related by contraction to those of the Poincaré group. PB Società Italiana di Fisica SN 0369-3546 YR 1974 FD 1974-05-21 LK https://hdl.handle.net/20.500.14352/64796 UL https://hdl.handle.net/20.500.14352/64796 DS Docta Complutense RD 25 abr 2025