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

A negative cosmological constant in the dark sector?

Jun 4, 2021, 3:54 PM


PhD forum talk + poster PhD Forum


Rodrigo Calderon (University of Montpellier)


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)


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

Presentation materials