MIDIT OFD CATS Modelling, Nonlinear Dynamics Optics and Fluid Dynamics Chaos and Turbulence Studies and Irreversible Thermodynamics Risø National Laboratory Niels Bohr Institute and Technical University of Denmark Building 128 Department of Chemistry Building 321 P.O. Box 49 University of Copenhagen DK-2800 Lyngby DK-4000 Roskilde DK-2100 Copenhagen Ø Denmark Denmark Denmark
by Dr. Sergej Flach
Max-Planck-Institut für Physik komplexer Systeme
Dresden, Germany
MIDIT-seminar 474
Thursday April 27, 2000, 15.00 h
at MIDIT, IMM, Bldg. 305, Room 027, DTU,
Abstract: Driven systems can show symmetry breaking behaviour induced by a low symmetry of the drive. Although the time averaged system seems to enjoy certain symmetries, it actually may not due to the low symmetric time dependence. This lecture will give an introdcution to the symmetry considerations of driven classical and quantum systems. The toy spin model with local anisotropy and external magnetic fields will be discussed both within the classical (nonlinear) framework and the quantum one - down to the case with spin 1 and 1/2.