• DOI:10.1088/1475-7516/2011/10/018
• Corpus ID: 263386

Palatini Actions and Quantum Gravity Phenomenology

@article{Olmo2011PalatiniAA,
  title={Palatini Actions and Quantum Gravity Phenomenology},
  author={Gonzalo J. Olmo},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2011},
  volume={2011},
  pages={018-018}
}

• G. Olmo
• Published 14 January 2011
• Physics
• Journal of Cosmology and Astroparticle Physics

We show that an invariant an universal length scale can be consistently intro- duced in a generally covariant theory through the gravitational sector using the Palatini approach. The resulting theory is able to capture different aspects of quantum gravity phenomenology in a single framework. In particular, it is found that in this theory field excitations propagating with different energy-densities perceive different background met- rics, which is a fundamental characteristic of the DSR and Rainbow Gravity approaches. We illustrate these properties with a particular gravitational model and explicitly show how the soccer ball problem is avoided in this framework. The isotropic and anisotropic cosmologies of this model also avoid the big bang singularity by means of a big bounce.