Can Geodesics in Extra Dimensions Solve the Cosmological Horizon Problem?

Details Can Geodesics in Extra Dimensions Solve the Cosmological Horizon Problem? Can Geodesics in Extra Dimensions Solve the Cosmological Horizon Problem?

1999-10-05

arxiv.org/abs/hep-ph/9910235v2

Phys.Rev. D62 (2000) 063513

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 2 figures

Scientific paper

10.1103/PhysRevD.62.063513

We demonstrate a non-inflationary solution to the cosmological horizon problem in scenarios in which our observable universe is confined to three spatial dimensions (a three-brane) embedded in a higher dimensional space. A signal traveling along an extra-dimensional null geodesic may leave our three-brane, travel into the extra dimensions, and subsequently return to a different place on our three-brane in a shorter time than the time a signal confined to our three-brane would take. Hence, these geodesics may connect distant points which would otherwise be ``outside'' the four dimensional horizon (points not in causal contact with one another).

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