Mathematics – Differential Geometry
Scientific paper
2007-09-10
Mathematics
Differential Geometry
43 pages. Some typos corrected; introduction expanded
Scientific paper
In a previous paper, we showed that any Jacobi field along a harmonic map from the 2-sphere to the complex projective plane is integrable (i.e., is tangent to a smooth variation through harmonic maps). In this paper, in contrast, we show that there are (non-full) harmonic maps from the 2-sphere to the 3-sphere and 4-sphere which have non-integrable Jacobi fields. This is particularly surprising in the case of the 3-sphere where the space of harmonic maps of any degree is a smooth manifold, each map having image in a totally geodesic 2-sphere.
Lemaire Luc
Wood John C.
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