On Explicit Holmes-Thompson Area Formula in Integral Geometry

Details On Explicit Holmes-Thompson Area Formula in Integral Geometry On Explicit Holmes-Thompson Area Formula in Integral Geometry

2010-09-26

arxiv.org/abs/1009.5057v1

Mathematics

Metric Geometry

Scientific paper

In this article, we give an exposition on the Holmes-Thompson theory developed by Alvarez. The space of geodesics in Minkowski space has a symplectic structure which is induced by the projection from the sphere-bundle. we show that it can be also obtained from the symplectic structure on the tangent bundle of the Riemannian manifold, the tangent bundle of the Minkowski unit sphere. We give detailed descriptions and expositions on Holmes-Thompson volumes in Minkowski space by the symplectic structure and the Crofton measures for them. For the Minkowski plane, a normed two dimensional space, we express the area explicitly in an integral geometry way, by putting a measure on the plane, which gives an extension of Alvarez's result for higher dimensional cases.

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