Jul 5 – 10, 2021
Europe/Rome timezone

Session

Status of the H_0 and Sigma_8 Tensions: Theoretical Models and Model-Independent Constraints

CM3
Jul 5, 2021, 4:30 PM

Conveners

Status of the H_0 and Sigma_8 Tensions: Theoretical Models and Model-Independent Constraints: Block 1

  • Joan Solà Peracaula (Universitat de Barcelona)
  • Adrià Gómez-Valent (Institut für Theoretische Physik Heidelberg)

Status of the H_0 and Sigma_8 Tensions: Theoretical Models and Model-Independent Constraints: Block 2

  • Adrià Gómez-Valent (Institut für Theoretische Physik Heidelberg)
  • Joan Solà Peracaula (Universitat de Barcelona)

Status of the H_0 and Sigma_8 Tensions: Theoretical Models and Model-Independent Constraints: Block 3

  • Joan Solà Peracaula (Universitat de Barcelona)
  • Adrià Gómez-Valent (Institut für Theoretische Physik Heidelberg)

Description

This session will be devoted to study the ability of the LCDM model (the "concordance model" of cosmology) to describe the modern cosmological observations and compare with model-independent analyses as well as with a variety of alternative theoretical frameworks which have been proposed to describe the same set of observations. Among the hot subjects that should be discussed in this session we have e.g.
i) The discordant measurements between the Hubble parameter determination from CMB data (under the assumption of the LCDM) and the (cosmology-independent) distance ladder determinations. Also the time-delay measurements from strongly lensed quasars and their current status;
ii) The long standing mismatch between the background and structure formation data, in particular the sigma_8 and S_8 tensions, both being quantities whose values in the LCDM are predicted to be larger than what is needed to improve the adjustment of the structure formation data obtained from galaxy clustering and weak lensing surveys;
iii) Possible solutions to the aforesaid tensions coming from theoretical models of different kinds; and
iv) The need to analyze data in a model independent way.
Discussions are also necessary concerning possible unaccounted systematic effects in the data.

Presentation materials

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