6533b7d7fe1ef96bd12690f6
RESEARCH PRODUCT
Phenomenological approaches of inflation and their equivalence
Olga MenaLotfi BoubekeurElena GiusarmaHéctor Ramírezsubject
PhysicsNuclear and High Energy PhysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)010308 nuclear & particles physicsFísicaFOS: Physical sciencesAstrophysics::Cosmology and Extragalactic AstrophysicsInflatonParameter space01 natural sciencessymbols.namesakeTheoretical physicsGeneral Relativity and Quantum Cosmology0103 physical sciencesAttractorsymbolsInflationary epochPlanck010306 general physicsScalar fieldEquivalence (measure theory)Eternal inflationAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
In this work, we analyze two possible alternative and model-independent approaches to describe the inflationary period. The first one assumes a general equation of state during inflation due to Mukhanov, while the second one is based on the slow-roll hierarchy suggested by Hoffman and Turner. We find that, remarkably, the two approaches are equivalent from the observational viewpoint, as they single out the same areas in the parameter space, and agree with the inflationary attractors where successful inflation occurs. Rephrased in terms of the familiar picture of a slowly rolling, canonically normalized scalar field, the resulting inflaton excursions in these two approaches are almost identical. Furthermore, once the Galactic dust polarization data from Planck are included in the numerical fits, inflaton excursions can safely take sub-Planckian values.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-11-26 |