Brane World Cosmology Without the Z_2 Symmetry

Davis, Anne-Christine; Vernon, Ian; Davis, Stephen C.; Perkins, Warren B.

Abstract

The Friedmann equation for a positive tension brane situated between two bulk spacetimes that posses the same 5D cosmological constant, but which does not posses a Z2 symmetry of the metric itself is derived, and the possible effects of dropping the Z2 symmetry on the expansion of our Universe are examined; cosmological constraints are discussed. We show the effect of this is an inflation-like period at very early times. The global solutions for the metric in the infinite extra dimension case are found and comparison with the symmetric case is made. We show that any brane world senario of this type must revert to a Z2 symmetric form at late times, and hence rule out certain proposed scenarios.

Citation

Davis, A., Vernon, I., Davis, S. C., & Perkins, W. B. (2001). Brane World Cosmology Without the Z_2 Symmetry. Physics Letters B, 504(3), 254-261. https://doi.org/10.1016/s0370-2693%2801%2900291-x

• Journal Article Type: Article
• Acceptance Date: Feb 19, 2001
• Online Publication Date: Mar 28, 2001
• Publication Date: Apr 12, 2001
• Deposit Date: Jan 9, 2009
• Publicly Available Date: Oct 12, 2017
• Journal: Physics Letters B
• Print ISSN: 0370-2693
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 504
• Issue: 3
• Pages: 254-261
• DOI: https://doi.org/10.1016/s0370-2693%2801%2900291-x
• Keywords: Extra-dimensions, Cosmology.
• Public URL: https://durham-repository.worktribe.com/output/1546697
• Related Public URLs: https://arxiv.org/abs/hep-ph/0008132v2