Graviton Emission into Non-Z_2 Symmetric Brane World Spacetimes

Vernon, Ian R.; Jennings, David

Abstract

The equations for the evolution of a homogeneous brane world that emits gravitons at early times, and into a non-Z_2 symmetric bulk, are derived using an AdS-Vaidya spacetime approximation. The behaviour of the black hole mass parameters either side of the brane is analysed, and it is found that in general graviton emission leads to a decrease in the non-Z_2 symmetry. However, the behaviour of the dark radiation term in the Friedmann equation is more complex: it is shown that this term can increase or decrease due to the non-Z_2 symmetry, and can become negative in some cases, leading to H=0 and the brane universe collapsing. Constraints on the initial (nonzero) sizes of the mass parameters are therefore derived.

Citation

Vernon, I. R., & Jennings, D. (2005). Graviton Emission into Non-Z_2 Symmetric Brane World Spacetimes. Journal of Cosmology and Astroparticle Physics, 07, https://doi.org/10.1088/1475-7516/2005/07/011

• Journal Article Type: Article
• Publication Date: 2005-07
• Deposit Date: Feb 15, 2008
• Publicly Available Date: Feb 15, 2008
• Journal: Journal of Cosmology and Astroparticle Physics
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 07
• DOI: https://doi.org/10.1088/1475-7516/2005/07/011
• Keywords: Extra-dimensions, Early universe cosmology.
• Publisher URL: http://uk.arxiv.org/abs/hep-th/0412083