Helicity is the only integral invariant of volume-preserving transformations
2016 ◽
Vol 113
(8)
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pp. 2035-2040
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Keyword(s):
We prove that any regular integral invariant of volume-preserving transformations is equivalent to the helicity. Specifically, given a functional ℐ defined on exact divergence-free vector fields of class C1 on a compact 3-manifold that is associated with a well-behaved integral kernel, we prove that ℐ is invariant under arbitrary volume-preserving diffeomorphisms if and only if it is a function of the helicity.
2012 ◽
Vol 53
(1)
◽
pp. 265-281
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Keyword(s):
2014 ◽
Vol 36
(3)
◽
pp. 832-859
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2008 ◽
Vol 237
(2)
◽
pp. 156-166
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Keyword(s):
2007 ◽
Vol 8
(3)
◽
pp. 335-355
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Keyword(s):
2007 ◽
Vol 27
(5)
◽
pp. 1399-1417
◽
2000 ◽
Vol 35
(4)
◽
pp. 589-596
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Keyword(s):