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math.DG2000
The geometry of three-forms in six and seven dimensions
Nigel Hitchin
We study the special algebraic properties of alternating 3-forms in 6 and 7 dimensions and introduce a diffeomorphism-invariant functional on the space of differential 3-forms on a…
math.DG2000
The Wess-Zumino term for a harmonic map
Nigel Hitchin
We calculate the Wess-Zumino term for a harmonic map of a closed surface to a compact, simply connected, simple Lie group in terms of the energy and the holonomy of…