Forma, Vol. 24 (No. 3), pp. 123-125, 2009

Nambu-Goldstone Mode and Spatiotemporal Chaos

Yoshiki Hidaka* and Shoichi Kai

Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
*E-mail address:

(Received March 13, 2010; Accepted March 27, 2010)

Abstract. It is well known that the Nambu-Goldstone (NG) mode accompanying spontaneous breaking of a continuous symmetry plays important roles in subatomic physics and in condensed-matter physics. Very recently new aspect has been discovered in nonlinear hydrodynamic systems related to NG modes. Here we introduce such a typical but, up to now, unique example which is observed in electroconvection in liquid crystals. The nonlinear interaction between the Nambu-Goldstone mode and the convective one induces a new type of spatiotemporal chaos, the so-called soft-mode turbulence.

Keywords: Spontaneous Breaking of Symmetry, Nambu-Goldstone Mode, Spatiotemporal Chaos, Soft-Mode Turbulence

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