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Bounded solutions of ideal MHD with compact support in space-time (1909.08678v1)
Published 18 Sep 2019 in math.AP, math-ph, and math.MP
Abstract: We show that in 3-dimensional ideal magnetohydrodynamics there exist infinitely many bounded solutions that are compactly supported in space-time and have non-trivial velocity and magnetic fields. The solutions violate conservation of total energy and cross helicity, but preserve magnetic helicity. For the 2-dimensional case we show that, in contrast, no nontrivial compactly supported solutions exist in the energy space.
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