Minimal Lie group homomorphisms

Details Minimal Lie group homomorphisms Minimal Lie group homomorphisms

2009-08-09

arxiv.org/abs/0908.1259v3

Mathematics

Differential Geometry

Scientific paper

Let $G_1$ and $G_2$ be Lie groups furnished with bi-invariant metrics and $f:G_1\rightarrow G_2$ be a Lie group homomorphism which is also a minimal isometric immersion. If $G_1$ is compact and connected, we prove that either $G_1$ is isometric to a flat torus or $f$ is unstable as a harmonic map. We also apply this result to the case in which $f$ is the inclusion of a compact, connected Lie subgroup of a Lie group, as well as to construct several examples of unstable harmonic maps into the orthogonal group.

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