Branes on the Horizon

Details Branes on the Horizon Branes on the Horizon

2001-07-24

arxiv.org/abs/hep-ph/0107250v1

JHEP 0111:015,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages, 12 figures, JHEP style

Scientific paper

10.1088/1126-6708/2001/11/015

Models with extra dimensions are often invoked to resolve cosmological problems. We investigate the possibility of apparent acausality as seen by a brane-based observer resulting from signal propagation through the extra dimensions. Null geodesics are first computed in static and cosmological single-brane models, following which we derive the equations of motion for the inter-brane distance in a two-brane scenario, which we use to examine possible acausality in this more complex setup. Despite observing significant effective acausality in some situations there is no a priori solution to the horizon problem using this mechanism. In the two-brane scenario there can be significant late time violation of gravitational Lorentz invariance, resulting in the gravitational horizon being larger than the particle horizon, leading to potential signals in gravitational wave detectors.

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