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We investigate dynamical symmetry enlargement in the half-filled SU(4)Hubbard chain using non-perturbative renormalization group and Quantum MonteCarlo techniques. A spectral gap is shown to open for arbitrary Coulombicrepulsion $U$. At weak coupling, $U \lesssim 3t$, a SO(8) symmetry betweencharge and spin-orbital excitations is found to be dynamically enlarged at lowenergy. At strong coupling, $U \gtrsim 6t$, the charge degrees of freedomdynamically decouple and the resulting effective theory in the spin-orbitalsector is that of the SO(6) antiferromagnetic Heisenberg model. Both regimesexhibit spin-Peierls order. However, although spin-orbital excitations are$incoherent$ in the SO(6) regime they are $coherent$ in the SO(8) one. Thecross-over between these regimes is discussed.Comment: 4 pages, 2 figure

Dynamical Symmetry Enlargement versus Spin-Charge Decoupling in the One-Dimensional SU(4) Hubbard Model