Seminarium "Teoria cząstek elementarnych i kosmologia"

Bouncing models followed by an inflationary phase can not only generate almost scale invariant fluctuation spectra, but also mitigate the large-scale anomalies of the Cosmic Microwave Background (CMB) by considering large non-Gaussianities on very large scales, which decay exponentially inside the horizon. For this reason, this non-Gaussianity was thought to be invisble in observations, as they only probe sub-horizon scales. In this talk I explain how such models can be excluded with high signifcances by the Planck data if their non-Gaussianity is enough to appreciably alleviate the large-scale anomalies. This result also shows the sensitivity of the Planck data to scales beyond the pivot scale.