https://doi.org/10.1140/epjc/s10052-009-1226-5
Regular Article - Theoretical Physics
Bare and effective fluid description in brane world cosmology
1
Departamento de Física, Facultad de Ciencia, Universidad de Santiago, Casilla 307, Santiago, Chile
2
Instituto de Física, Pontificia Universidad Católica de Valparaíso, Casilla 4950, Valparaíso, Chile
3
Departamento de Ciencias Físicas, Facultad de Ingeniería, Ciencias y Administración, Universidad de La Frontera, Avda. Francisco Salazar 01145, Casilla 54-D, Temuco, Chile
* e-mail: joel.saavedra@ucv.cl
Received:
12
June
2009
Revised:
15
October
2009
Published online:
10
December
2009
An effective fluid description, for a brane world model in five dimensions, is discussed for both signs of the brane tension. We found several cosmological scenarios where the effective equation differs widely from the bare equation of state. For universes with negative brane tension, with a bare fluid satisfying the strong energy condition, the effective fluid can cross the barrier ω eff=−1.
© Springer-Verlag / Società Italiana di Fisica, 2010