RESEARCH
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Investigating cosmic discordances

Eleonora Di Valentino
Durham University

Abstract
The Cosmic Microwave Background temperature and polarization anisotropy measurements from the Planck mission have provided strong confirmation of the LCDM model of structure formation. However, this model is based on unknown quantities and can be considered an approximation to a more realistic scenario that still needs to be fully understood. With the increase in experimental sensitivity, therefore, deviations from the LCDM model are expected, and, actually, a few interesting tensions between the cosmological probes and anomalies in the CMB data are present with different statistical significance. While some portion of these discrepancies may have a systematic origin, their persistence across probes strongly hints at cracks in the standard LCDM cosmological scenario.The most statistically significant are the Hubble constant and the S8 parameter tensions, the Alens anomaly and a curvature of the Universe. I will review these tensions, showing some interesting extended cosmological scenarios that can alleviate them.

2021 March 15, 15:30

IA
Online broadcast (Zoom)

Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia