Algebraic approach and coherent states for a relativistic quantum   particle in cosmic string spacetime
  We study a relativistic quantum particle in cosmic string spacetime in the presence of a uniform magnetic field and a Coulomb-type scalar potential. It is shown that the radial part of this problem possesses the $su(1,1)$ symmetry. We obtain the energy spectrum and eigenfunctions of this problem by using two algebraic methods: the Schr\"odinger factorization and the tilting transformation. Finally, we give the explicit form of the relativistic coherent states for this problem. 
M. Salazar-Ram\'irez, D. Ojeda-Guill\'en, R. D. Mota
quant-ph