TY  - JOUR
AU  - Olmo, G. J.
PY  - 2011
DA  - 2011//
TI  - Palatini actions and quantum gravity phenomenology
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 018
EP  - 15pp
VL  - 10
IS  - 10
PB  - Iop Publishing Ltd
KW  - quantum gravity phenomenology
KW  - cosmic singularity
AB  - We show that an invariant an universal length scale can be consistently introduced 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 metrics, 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.
SN  - 1475-7516
UR  - http://arxiv.org/abs/1101.2841
UR  - https://doi.org/10.1088/1475-7516/2011/10/018
DO  - 10.1088/1475-7516/2011/10/018
LA  - English
N1  - WOS:000296767600018
ID  - Olmo2011
ER  -