A new multi-scale hierarchical framework in GR uses matter horizons to extend perturbation theory beyond shell-crossing by gluing spacetimes with opposite orientation.
Causal structures in cosmology
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abstract
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.
years
2026 2verdicts
UNVERDICTED 2representative citing papers
In bouncing cosmological backgrounds, event and particle horizons can appear or disappear independently of the local expansion rate because they are determined by the full spacetime history.
citing papers explorer
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An essential building block for cosmological zoom-in perturbation theory
A new multi-scale hierarchical framework in GR uses matter horizons to extend perturbation theory beyond shell-crossing by gluing spacetimes with opposite orientation.
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Cosmological horizons in regular bouncing backgrounds
In bouncing cosmological backgrounds, event and particle horizons can appear or disappear independently of the local expansion rate because they are determined by the full spacetime history.