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Diego Saez-Gomez

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0.8<br />

1.006<br />

1.0<br />

Cosmological evolution<br />

in viable f(R)<br />

1.0 0.5 0.0 0.5 1.0<br />

Hu-Sawicki and Nojiri-Odintsov model<br />

z<br />

(a)<br />

1.00 0.95 0.90 0.85 0.80<br />

Figure 1: Evolution of the EoS parameter (12) as a function of the redshift z for the models F HS (R)<br />

and F NO (R). Herewehaveassumedtheinitialconditionsh(0) = 1 and h<br />

2. Phantom initial conditions<br />

(0) = 0.4, accordingto(14).<br />

The panel 1a shows the evolution from the past to the future, where the phantom barrier is crossed for<br />

negative redshifts in EoS both parameter models. The panel 1b shows in more detail the range −1

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