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## Timelike Hilbert geometry of the spherical simplex

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#### Abstract

We prove the following result on the timelike spherical Hilbert geometry of simplices: Let $\Delta_2$ be a simplex on the 2-sphere and $\tilde{\Delta}_2$ the antipodal simplex. We show that the timelike spherical Hilbert geometry associated with the pair $\Delta_2, \tilde{\Delta}_2$ is isometric to a union of six copies of vector spaces equipped with a timelike norm, isometrically and transitively acted upon by the group $\mathbb{R}_{>0}^2 \times \mathbb{Z}_3\times \mathbb{Z}_2$. This is a timelike spherical analogue of a well-known result (due to Busemann) stating that the Hilbert metric of a Euclidean simplex is isometric to a metric induced by a normed vector space. At the same time, this gives a new example of timelike space.

### Dates and versions

hal-04015534 , version 1 (07-03-2023)

### Identifiers

• HAL Id : hal-04015534 , version 1
• ARXIV :

### Cite

Athanase Papadopoulos, Sumio Yamada. Timelike Hilbert geometry of the spherical simplex. 2023. ⟨hal-04015534⟩

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