Graviton emission into nonZ_{2} symmetric brane world spacetimes
Abstract
The equations for the evolution of a homogeneous brane world that emits gravitons at early times, and into a nonZ_{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 nonZ_{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 nonZ_{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.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 July 2005
 DOI:
 10.1088/14757516/2005/07/011
 arXiv:
 arXiv:hepth/0412083
 Bibcode:
 2005JCAP...07..011V
 Keywords:

 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 24 pages, 12 figures