Cosmo-26

Negentropy contraints on primordial nongaussianity

Not scheduled

20m

Gorlaeus gebouw (Leiden University)

Talk Cosmic Microwave Background

Speaker

Spyros Sypsas (Centro de Ciencias Exactas, Universidad del Biobio)

Description

The CMB is gaussian, at least according to the estimators that have been used in surveys like Planck, which is the bispectrum and trispectrum. In recent years there have been various proposals of nongaussian signatures that spread through out the whole PDF of fluctuations, and in some cases cannot be captured by looking at lower n-point functions. We propose the negentropy as a single-point estimator that captures generic deviations from gaussianity and apply it to the Planck data in order to constrain models that lead to such signals. As an application we derive analytic constrains on spectator axions during inflation.