On the Liouville theorem for weak Beltrami flows

초록

We study Beltrami flows in the setting of weak solution to the stationary Euler equations in R-3. For this weak Beltrami flow we prove the regularity and the Liouville property. In particular, we show that if the tangential part of the velocity has a certain decay property at infinity, then the solution becomes trivial. This decay condition of the velocity is weaker than the previously known sufficient conditions for the Liouville property of the Betrami flows. For the proof we establish a mean value formula and other various formulas for the tangential and the normal components of the weak solutions to the stationary Euler equations.

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