Quantum Localisation Observables and Accelerated Frames
  We define quantum observables associated with Einstein localisation in space-time. These observables are built on Poincare' and dilatation generators. Their commutators are given by spin observables defined from the same symmetry generators. Their shifts under transformations to uniformly accelerated frames are evaluated through algebraic computations in conformal algebra. Spin number is found to vary under such transformations with a variation involving further observables introduced as irreducible quadrupole momenta. Quadrupole observables may be dealt with as non commutative polarisations which allow one to define step operators increasing or decreasing the spin number by unity. 
Marc-Thierry Jaekel (Laboratoire de Physique The'orique de l'Ecole   Normale Supe'rieure) and Serge Reynaud (Laboratoire Kas...