Diego Saez-Gomez

(z = 0) = H 0 = 100 hkms −1 Mpc −1 ,h=0.71 ± 0.03 (5)
)= κ2
2
Scalar-tensor representation of
f(r) gravity
ρ m
H 0 (1 + z)h(z) , → H (0) = κ2
ρ 0 m = 3 2H 0 2 Ω0 m . (6)
Nojiri-Odintsov model
H (0) 0 (7)
n in viable Ωmodified m (z) , Ω f(R) gravity (z) (8) 13
Phase space
2.0
V + (φ) V − (φ) (9)
1.5
H 2 H 0
2
1.0
0.5
5 0.80 0.85 0.90
(a)
Φ
0.0
0.0 0.5 1.0 1.5 2.0
Φ
(b)
The Hubble parameter tends to a an asymptotically stable dS point.
of the HS model (panel 8a), and the NO model (8b). In both models, the
DSG, Class.Quant.Grav. 30 095008 (2013)