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We investigate the collective behavior of orbital angular momentum in thespin ferromagnetic state of a Mott insulator with $t_{2g}$ orbital degeneracy.The frustrated nature of the interactions leads to an infinite degeneracy ofclassical states. Quantum effects select four distinct orbital orderings. Twoof them have a quadrupolar order, while the other states show in addition weakorbital magnetism. Specific predictions are made for neutron scatteringexperiments which might help to identify the orbital order in YTiO$_3$ and todetect the elementary orbital excitations.Comment: to appear in Phys. Rev. Let

Quantum Behavior of Orbitals in Ferromagnetic Titanates: Novel Orderings and Excitations