Münster 1999 – scientific programme

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SYRO: Symposium Rauschinduzierte Ordnung in räumlich ausgedehnten Systemen

SYRO 2: Rauschinduzierte Ordnung II

SYRO 2.5: Talk

Tuesday, March 23, 1999, 17:30–17:45, R~4

Renormalization group analysis of a model J with dynamical anisotropy — •Jaime Santos¹, Uwe Täuber^1,2, and Zoltán Rácz³ — ¹Institut für Theoretische Physik T34, TU München, James-Franck Strasse, 85747 Garching, Germany — ²Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0435, USA — ³Institute for Theoretical Physics, Eötvös University, 1088 Budapest, Puskin u. 5-7, Hungary.

We consider the renormalization group analysis to one loop order of a model J for ferromagnets with anisotropic noise. This system is driven out of equilibrium by the dynamical anisotropy in the noise, i.e. by constraining its diffusive dynamics to be at different temperatures T^|| and T^⊥ in d_|| and d_⊥-dimensional subspaces, respectively. We find that the noise anisotropy is a relevant perturbation and that the static and dynamical critical behaviour is described by an hitherto unidentified universality class, which does not seem to be accessible by perturbational means, at least for d_||≥ 1 [1].

[1] U. C. Täuber, J. E. Santos and Z. Rácz, cond-mat/9807207. To be published in EPJB.