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Diego Saez-Gomez

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H(z = 0) = H 0 = 100 hkms −1 Mpc −1 ,h=0.71 ± 0.03 (5)<br />

Scalar-tensor representation of<br />

H (z) = κ2<br />

2<br />

ρ m<br />

f(r) gravity<br />

H 0 (1 + z)h(z) , → H (0) = κ2<br />

ρ 0 m = 3 2H 0 2 Ω0 m . (6)<br />

Nojiri-Odintsov model<br />

H (0) 0 (7)<br />

Ω m (z) , Ω f(R) (z) (8)<br />

n in viable modified Phase space gravity 15<br />

V + (φ) V − (φ) (9)<br />

1.6<br />

1.4<br />

1.2<br />

H 2 H 0<br />

2<br />

1.0<br />

0.8<br />

0.6<br />

.94 0.96 0.98 1.00<br />

(a)<br />

Φ<br />

0.4<br />

2.0 2.2 2.4 2.6 2.8 3.0<br />

The scalar field reaches its boundary, where (b) a sudden singularity occurs.<br />

Φ<br />

DSG, Class.Quant.Grav. 30 095008 (2013)

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