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Journal Articles Comptes Rendus. Physique Year : 2015

Causal structures in inflation

George F. R. Ellis
  • Function : Author
Jean-Philippe Uzan


This article reviews the properties and limitations associated with the existence of particle, visual, and event horizons in cosmology in general and in inflationary universes in particular, carefully distinguishing them from 'Hubble horizons'. It explores to what extent one might be able to probe conditions beyond the visual horizon (which is close in size to the present Hubble radius), thereby showing that visual horizons place major limits on what are observationally testable aspects of a multiverse, if such exists. Indeed these limits largely prevent us from observationally proving a multiverse either does or does not exist. We emphasize that event horizons play no role at all in observational cosmology, even in the multiverse context, despite some claims to the contrary in the literature.


Dates and versions

insu-03644680 , version 1 (19-04-2022)



George F. R. Ellis, Jean-Philippe Uzan. Causal structures in inflation. Comptes Rendus. Physique, 2015, 16, pp.928-947. ⟨10.1016/j.crhy.2015.07.005⟩. ⟨insu-03644680⟩
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