TL;DR
This paper investigates the causal structure of brane universes, revealing potential causality violations due to matter energy and addressing the horizon problem in Friedmann-Robertson-Walker branes.
Contribution
It analyzes the causal structure related to null geodesics in the bulk and clarifies the conditions under which causality violations and horizon issues occur.
Findings
Causality violation is possible in matter-filled brane universes.
No horizon problem exists in Friedmann-Robertson-Walker brane models.
Null geodesic analysis clarifies causal relations in brane cosmology.
Abstract
Causal structure of the brane universe with respect to null geodesics in the bulk spacetime is studied. It is pointed out that apparent causality violation is possible for the brane universe which contains matter energy. It is also shown that there is no 'horizon problem' in the Friedmann-Robertson-Walker brane universe.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.