Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-07-08
Phys.Rev.D80:046003,2009
Physics
High Energy Physics
High Energy Physics - Theory
7 pages, 1 figure, accepted for publication in Physical Review D
Scientific paper
10.1103/PhysRevD.80.046003
Motivated by possible extensions of the braneworld models with two branes, we investigate some consequences of a variable brane tension using the well established results on consistency conditions. By a slight modification of the usual stress-tensor used in order to derive the braneworld sum rules, we find out some important constraints obeyed by time dependent brane tensions. In particular it is shown that the tensions of two Randall-Sundrum like branes obeying, at the same time, an Eotvos law, aggravate the fine tuning problem. Also, it is shown that if the hidden brane tension obeys an Eotvos law, then the visible brane has a mixed behavior allowing a bouncing-like period at early times while it is dominated by an Eotvos law nowadays. To finalize, we discuss some qualitative characteristics which may arise in the scope of dynamical brane tensions, as anisotropic background and branons production.
Abdalla M. C. B.
da Silva Julio M. Hoff
Rocha Roldao da
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