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math.DG2024
Left-invariant Pseudo-Riemannian metrics on Lie groups: The null cone II
Sigbjørn Hervik
We continue to study left-invariant pseudo-Riemannian metrics on Lie groups being in the null cone of the -action using the moving bracket approach. In particular, the Lie…
math.DG2024
Left-invariant Pseudo-Riemannian metrics on Lie groups: The null cone
Sigbjorn Hervik
We study left-invariant pseudo-Riemannian metrics on Lie groups using the bracket flow of the corresponding Lie algebra. We focus on metrics where the Lie algebra is in the null co…
math.DG2017★ 6 cited
Wick rotations and real GIT
Christer Helleland, Sigbjorn Hervik
We define Wick-rotations by considering pseudo-Riemannian manifolds as real slices of a holomorphic Riemannian manifold. From a frame bundle viewpoint Wick-rotations between differ…