Vernon, I. R. and Jennings, D. (2005) 'Graviton emission into non-Z_2 symmetric brane world spacetimes.', Journal of cosmology and astroparticle physics., 07 . 011.
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.
|Keywords:||Extra-dimensions, Early universe cosmology.|
|Full text:||PDF - Accepted Version (536Kb)|
|Publisher Web site:||http://dx.doi.org/10.1088/1475-7516/2005/07/011|
|Record Created:||15 Feb 2008|
|Last Modified:||21 Oct 2010 14:54|
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