TY  - JOUR
AU  - Olmo, G. J.
AU  - Rubiera-Garcia, D.
PY  - 2015
DA  - 2015//
TI  - Brane-world and loop cosmology from a gravity-matter coupling perspective
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 73
EP  - 79
VL  - 740
PB  - Elsevier Science Bv
KW  - Modified gravity
KW  - Palatini formalism
KW  - f(R) theories
KW  - Gravity-matter coupling
KW  - Quadratic cosmology
AB  - We show that the effective brane-world and the loop quantum cosmology background expansion histories can be reproduced from a modified gravity perspective in terms of an f (R) gravity action plus a g(R) term non-minimally coupled with the matter Lagrangian. The reconstruction algorithm that we provide depends on a free function of the matter density that must be specified in each case and allows to obtain analytical solutions always. In the simplest cases, the function f (R) is quadratic in the Ricci scalar, R, whereas g(R) is linear. Our approach is compared with recent results in the literature. We show that working in the Palatini formalism there is no need to impose any constraint that keeps the equations second order, which is a key requirement for the successful implementation of the reconstruction algorithm.
SN  - 0370-2693
UR  - http://arxiv.org/abs/1405.7184
UR  - https://doi.org/10.1016/j.physletb.2014.11.034
DO  - 10.1016/j.physletb.2014.11.034
LA  - English
N1  - WOS:000347046200013
ID  - Olmo+Rubiera-Garcia2015
ER  -