# 28th Texas Symposium on Relativistic Astrophysics

13-18 December 2015
International Conference Centre Geneva
Europe/Zurich timezone

## Probing violations of slow-roll inflation at the largest observable scales with future galaxy surveys

14 Dec 2015, 15:03
21m
Level -1, Room 17 (International Conference Centre Geneva)

### Level -1, Room 17

#### International Conference Centre Geneva

17 Rue de Varembé, 1211 Geneva

### Speaker

Mario Ballardini (University of Bologna)

### Description

The predictions of the simplest inflationary models, such as a flat Universe and Gaussian adiabatic perturbations with a red tilt, provide a remarkable good fit to the most recent measurements of CMB temperature and polarization anisotropies. Nevertheless, deviations from a simple power-law spectrum provide a better fit to Planck temperature anisotropies data, in particular on the largest scales, i.e. at $k < 0.008\ Mpc^{-1}$, although at a non-statistical significant level because of cosmic variance. We study the capability of future galaxy surveys as EUCLID and other experiments to distinguish possible deviations from a simple power-law for primordial perturbation on these large scales.

### Primary author

Mario Ballardini (University of Bologna)