Artículo de revista
Constraints on inflation with LSS surveys: Features in the primordial power spectrum
Fecha
2018Registro en:
Journal of Cosmology and Astroparticle Physics, Volumen 2018, Issue 6, 2018
14757516
10.1088/1475-7516/2018/06/004
Autor
Palma, Gonzalo
Sapone, Domenico
Sypsas, Spyros
Institución
Resumen
We analyse the efficiency of future large scale structure surveys to unveil
the presence of scale dependent features in the primordial spectrum –resulting
from cosmic inflation– imprinted in the distribution of galaxies. Features may
appear as a consequence of non-trivial dynamics during cosmic inflation, in
which one or more background quantities experienced small but rapid deviations from their characteristic slow-roll evolution. We consider two families of
features: localised features and oscillatory extended features. To characterise
them we employ various possible templates parametrising their scale dependence and provide forecasts on the constraints on these parametrisations for
LSST like surveys. We perform a Fisher matrix analysis for three observables:
cosmic microwave background (CMB), galaxy clustering and weak lensing. We
find that the combined data set of these observables will be able to limit the
presence of features down to levels that are more restrictive than current constraints coming from CMB observations only. In particular, we address the
possibility of gaining information on currently known deviations from scale invariance inferred from CMB data, such as the feature appearing at the ℓ ∼ 20
multipole (which is the main contribution to the low-ℓ deficit) and another
one around ℓ ∼ 800.