The concept of *pseudo-orthogonal structure* is the analog of that of *orthogonal structure* as one generalized from Euclidean signature to Lorentzian signature.

Given a smooth manifold $X$ of dimension $n$, then a *pseudo-orthogonal structure* of $X$ is a reduction of the structure group of its frame bundle along the inclusion $O(n-1,1) \hookrightarrow GL(n)$ of the Lorentz group into the general linear group.

In physics, specifically in the first-order formulation of gravity, such a G-structure is often called a *vielbein* field.

A pseudo-orthogonal structure induces a pseudo-Riemannian metric on $X$.

Created on July 22, 2017 at 14:08:12. See the history of this page for a list of all contributions to it.