非平衡“ゆらぎ”の面白さ

生命現象との関連で考える

抄録

The difference of the fluctuation between equilibrium and thermodynamically open systems is discussed. Under linear regimes in the non-equilibricity, fluctuation always causes the destruction of spatial and temporal structures. In contract, under nonlinear regime spontaneous symmetry breaking of the spatio-temporal structure is generated driven by fluctuation. From actual experiments concerning the spontaneous motion of an liquid droplet, it is shown that non-equilibrium fluctuation causes regular motion, accompanied by the reduction of the vast number of freedoms. It is expected that the essential scenario on the energy transduction from chemical into regular motion in molecular machinery exhibits its theoretical basis on the exotic effect of non-equilibrium fluctuation.