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Dynamical Symmetries and Causality in Non-Equilibrium Phase Transitions.

Abstract : Dynamical symmetries are of considerable importance in elucidating the complex behaviour of strongly interacting systems with many degrees of freedom. Paradigmatic examples are cooperative phenomena as they arise in phase transitions, where conformal invariance has led to enormous progress in equilibrium phase transitions, especially in two dimensions. Non-equilibrium phase transitions can arise in much larger portions of the parameter space than equilibrium phase transitions. The state of the art of recent attempts to generalise conformal invariance to a new generic symmetry, taking into account the different scaling behaviour of space and time, will be reviewed. Particular attention will be given to the causality properties as they follow for co-variant n-point functions. These are important for the physical identification of n-point functions as responses or correlators.
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Malte Henkel. Dynamical Symmetries and Causality in Non-Equilibrium Phase Transitions.. Symmetry, MDPI, 2015, 7 (4), pp.2108-2133. ⟨10.3390/sym7042108⟩. ⟨hal-01298496⟩



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