Cross-tests of CMB features in the primordial spectra

TL;DR

This paper investigates potential features in the cosmic microwave background's primordial spectra, exploring their implications across multiple observables to enhance understanding of early universe physics.

Contribution

It analyzes correlations between CMB features and other cosmological observables, proposing methods to improve detection and understanding of primordial spectrum deviations.

Findings

Features in CMB power spectrum may also appear in bispectrum and tensor spectra

Cross-observational analysis can increase detection significance

Provides a framework for future observational tests

Abstract

The recent Planck data on the power spectrum of temperature anisotropies of the cosmic microwave background marginally support deviations from the $\Lambda$CDM model at several multipoles. With a view towards current and forthcoming observational surveys, we trace these features to other observables like the scalar bispectrum and the tensor power spectrum. A possible detection of such bumps in these channels would increase their statistical significance shedding light on the ultra violet mechanisms responsible for their appearance in the data.