Mathematics – Dynamical Systems
Scientific paper
2009-06-18
Mathematics
Dynamical Systems
19 pages, 2 figures; published version
Scientific paper
In this sequel we extend the derivation of the third order helicity to magnetic fields supported on unlinked domains in 3-space. The formula is expressed in terms of generators of the deRham cohomology of the configuration space of three points in $\R^3$, which is a more practical domain from the perspective of applications. It also admits an ergodic interpretation as an average asymptotic Milnor $\bar{\mu}_{123}$-invariant and allows us to obtain the $L^2$-energy bound for the magnetic field. As an intermediate step we derive an integral formula for Milnor $\bar{\mu}_{123}$-invariant for parametrized Borromean links in $\R^3$.
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