May 31, 2021 to June 4, 2021
Online
Europe/Madrid timezone

A negative cosmological constant in the dark sector?

Jun 4, 2021, 3:54 PM
6m
Online

Online

PhD forum talk + poster PhD Forum

Speaker

Rodrigo Calderon (University of Montpellier)

Description

Following theoretical (high-energy physics) considerations, we explore the possibility that our Universe contains a negative cosmological constant, dubbed $\lambda$, on top of an additional component $X$ accounting for the late-time accelerated stage of expansion. In this talk, I will present some of the cosmological implications of introducing $\lambda$. In particular, we will assess the viability of such models when considering Baryon Acoustic Oscillations, SNeIa and CMB (geometrical) measurements. We estimate the Bayesian evidence in various cosmological scenarios through a nested sampling of the parameter space, and compare it to base-$\Lambda$CDM for model selection. We will briefly comment on their capability to address the current Hubble tension when a high-$H_0$ is taken into account.

arXiv number (if applicable) 2008.10237

Primary author

Rodrigo Calderon (University of Montpellier)

Co-authors

Dr Radouane Gannouji Dr Benjamin L'Huillier Prof. David Polarski (Laboratoire Charles Coulomb, Université de Montpellier)

Presentation materials