TY  - JOUR
AU  - Makarenko, A. N.
AU  - Odintsov, S.
AU  - Olmo, G. J.
PY  - 2014
DA  - 2014//
TI  - Born-Infeld f(R) gravity
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 024066
EP  - 15pp
VL  - 90
IS  - 2
PB  - Amer Physical Soc
AB  - Motivated by the properties of matter quantum fields in curved space-times, we work out a gravity theory that combines the Born-Infeld gravity Lagrangian with an f(R) piece. To avoid ghostlike instabilities, the theory is formulated within the Palatini approach. This construction provides more freedom to address a number of important questions, such as the dynamics of the early Universe and the cosmic accelerated expansion, among others. In particular, we consider the effect that adding an f(R) = aR(2) term has on the early-time cosmology. We find that bouncing solutions are robust against these modifications of the Lagrangian whereas the solutions with loitering behavior of the original Born-Infeld theory are very sensitive to the R-2 term. In fact, these solutions are modified in such a way that a plateau in the H-2 function may arise, yielding a period of (approximately) de Sitter inflationary expansion. This inflationary behavior may be found even in a radiation-dominated universe.
SN  - 1550-7998
UR  - http://arxiv.org/abs/arXiv:1403.7409
UR  - https://doi.org/10.1103/PhysRevD.90.024066
DO  - 10.1103/PhysRevD.90.024066
LA  - English
N1  - WOS:000341262300003
ID  - Makarenko_etal2014
ER  -