TY - JOUR
T1 - Randall-Sundrum brane cosmology
T2 - Modification of late-time cosmic dynamics by exotic matter
AU - García-Salcedo, Ricardo
AU - Gonzalez, Tame
AU - Moreno, Claudia
AU - Quiros, Israel
PY - 2011/5/21
Y1 - 2011/5/21
N2 - In this paper we show, through the study of concrete examples, that depending on the cosmic dynamics of the energy density of matter degrees of freedom living in the brane, Randall-Sundrum (RS) brane effects can be important not only at short distances (UV regime), but also at large cosmological scales (IR regime). Our first example relies on the study, by means of the dynamical system tools, of a toy model based in a nonlinear electrodynamics (NLED) Lagrangian. Then we show that other, less elaborated models, such as the inclusion of a scalar phantom field, and of a tachyon phantom field - trapped in the brane - produce similar results. The form of the RS correction seems to convert what would have been future attractors in general relativity into saddle points. The above 'mixing of scales' effect is distinctive only of theories that modify the right-hand side (matter part) of the Friedmann equation, so that, for instance, Dvali-Gabadadze-Porrati-brane models do not show this feature.
AB - In this paper we show, through the study of concrete examples, that depending on the cosmic dynamics of the energy density of matter degrees of freedom living in the brane, Randall-Sundrum (RS) brane effects can be important not only at short distances (UV regime), but also at large cosmological scales (IR regime). Our first example relies on the study, by means of the dynamical system tools, of a toy model based in a nonlinear electrodynamics (NLED) Lagrangian. Then we show that other, less elaborated models, such as the inclusion of a scalar phantom field, and of a tachyon phantom field - trapped in the brane - produce similar results. The form of the RS correction seems to convert what would have been future attractors in general relativity into saddle points. The above 'mixing of scales' effect is distinctive only of theories that modify the right-hand side (matter part) of the Friedmann equation, so that, for instance, Dvali-Gabadadze-Porrati-brane models do not show this feature.
UR - http://www.scopus.com/inward/record.url?scp=79957491164&partnerID=8YFLogxK
U2 - 10.1088/0264-9381/28/10/105017
DO - 10.1088/0264-9381/28/10/105017
M3 - Artículo
SN - 0264-9381
VL - 28
JO - Classical and Quantum Gravity
JF - Classical and Quantum Gravity
IS - 10
M1 - 105017
ER -