<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Universal scaling dynamics at non-thermal fixed points in multi-component Bose gases far from equilibrium"^^ . "Far from equilibrium, comparatively little is known about the possibilities nature reserves for the structure and states of quantum many-body systems.\r\nA potential scenario is that these systems can approach a non-thermal fixed point and show universal scaling dynamics.\r\nThe associated spatio-temporal self-similar evolution of correlations is characterized by universal scaling functions and scaling exponents.\r\nIn this thesis, we investigate the universal scaling behavior of multi-component bosonic quantum gases from a theoretical point of view. \r\nIn particular, we perform numerical simulations of spin-1 Bose gases in one and two spatial dimensions.\r\nTo enable universal scaling dynamics, we prepare far-from-equilibrium initial configurations by making use of instabilities arising from a parameter quench between different phases of the spin-1 model.\r\nThe subsequent universal scaling at the non-thermal fixed point is driven by the annihilation and dissolution of (quasi)topological \r\nexcitations.\r\nIn addition, we make analytical predictions for the non-thermal fixed point scaling of $U(N)$-symmetric models \r\nwhich we corroborate with numerical simulations of a $U(3)$-symmetric Bose gas in three spatial dimensions.\r\nWe find that the scaling behavior at the fixed point is dominated by the conserved redistribution of collective excitations.\r\nFurthermore, we introduce prescaling as a generic feature of the evolution of a quantum many-body system towards\r\na non-thermal fixed point.\r\nDuring the prescaling evolution, some well-measurable properties of spatial correlations already scale with the universal exponents of the fixed point while others still show scaling violations. \r\nWe illustrate the existence of prescaling by means of numerical simulations of a three-dimensional $U(3)$-symmetric Bose gas.\r\nThe research presented in this thesis contributes to a deeper understanding of universal scaling dynamics far from equilibrium.\r\nIn particular, it unravels important key aspects for establishing out-of-equilibrium universality classes. \r\nFurthermore, the introduced concept of prescaling allows bridging the gap in the time evolution from the initial state to the associated non-thermal fixed point."^^ . "2020" . . . . . . . "Christian-Marcel"^^ . "Schmied"^^ . "Christian-Marcel Schmied"^^ . . . . . . "Universal scaling dynamics at non-thermal fixed points in multi-component Bose gases far from equilibrium (PDF)"^^ . . . "Dissertation_CMSchmied.pdf"^^ . . . "Universal scaling dynamics at non-thermal fixed points in multi-component Bose gases far from equilibrium (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Universal scaling dynamics at non-thermal fixed points in multi-component Bose gases far from equilibrium (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Universal scaling dynamics at non-thermal fixed points in multi-component Bose gases far from equilibrium (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Universal scaling dynamics at non-thermal fixed points in multi-component Bose gases far from equilibrium (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Universal scaling dynamics at non-thermal fixed points in multi-component Bose gases far from equilibrium (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #28480 \n\nUniversal scaling dynamics at non-thermal fixed points in multi-component Bose gases far from equilibrium\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .