6533b82efe1ef96bd12929c7

RESEARCH PRODUCT

Palatini actions and quantum gravity phenomenology

Gonzalo J. OlmoGonzalo J. Olmo

subject

High Energy Physics - TheoryLength scalePhysicsFOS: Physical sciencesAstronomy and AstrophysicsGeneral Relativity and Quantum Cosmology (gr-qc)Invariant (physics)General Relativity and Quantum CosmologyGravitationTheoretical physicsGeneral Relativity and Quantum CosmologySingularityHigh Energy Physics - Theory (hep-th)Quantum gravityCovariant transformationPhenomenology (particle physics)Big Bounce

description

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.

http://hdl.handle.net/10261/66125