Diego Saez-Gomez
Diego Saez-Gomez
Diego Saez-Gomez
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Summary<br />
Viable modified gravities reproduce a sudden singularity, which<br />
may be circumvented in the scalar-tensor picture.<br />
The transition to a phantom phase probably occurs in the class of<br />
the so-called viable f(R) gravities, where the EoS parameter<br />
presents an oscillating behavior, but no future singularity or Little<br />
Rip occurs.<br />
The analysis of a simple model of f(R) gravity, and its test with<br />
the Sne Ia reveals that the f(R) gravities can describe late-time<br />
acceleration with great accuracy.<br />
f(R,T) gravities seem to be ruled out, since the non-standard<br />
coupling among matter and gravity introduce an anomalous<br />
behavior in the matter perturbations.