Stabilization of branes in a cosmological setting
Abstract
We study some cosmological consequences of the five dimensional, two brane RandallSundrum scenario. We integrate over the extra dimensions and in four dimensions the action reduces to that of scalar tensor gravity. The radius of the compact extra dimension is taken to be time dependent.It is shown that the radius of the extra dimension rapidly approaches a constant nonzero separation of branes. A radion dominated universe cannot undergo accelerated expansion in the absence of a potential.It is shown that a simple quadratic potential with minimum at zero leads to constant nonzero separation of branes in a similar level but now accelerated expansion is possible. After stabilization the quadratic potential contributes an effective cosmological constant term.We show that with a suitable tuning of parameters the requirements for solving the hierarchy problem and getting an effective dark energy can be satisfied simultaneously.
 Publication:

arXiv eprints
 Pub Date:
 December 2003
 arXiv:
 arXiv:hepth/0312253
 Bibcode:
 2003hep.th...12253J
 Keywords:

 Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 Revtex4, 5 pages, 2 postscript figures