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We consider a hydrogen atom in the background spacetimes generated by aninfinitely thin cosmic string and by a point-like global monopole. In bothcases, we find the solutions of the corresponding Dirac equations and wedetermine the energy levels of the atom. We investigate how the geometric andtopological features of these spacetimes leads to shifts in the energy levelsas compared with the flat Minkowski spacetime.Comment: 17 pages, LATEX fil

Hydrogen atom in the gravitational fields of topological defects