Marco Oppio UniversitÃ di Trento Papers Quantum theory in quaternionic Hilbert space: How PoincarÃ© symmetry reduces the theory to the standard complex one Valter Moretti, Marco Oppio September 26, 2017 quaternionic quantum mechanics, spectral theory, representation theory, von Neumann algebras open access link article file Quantum theory in real Hilbert space: How the complex Hilbert space structure emerges from PoincarÃ© symmetry Valter Moretti, Marco Oppio November 28, 2016 relativistic quantum theory, real spectral theory, representation theory open access link Reviews in Mathematical Physics 29, 1750021 (2017)