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2025

New insights on a sign-switching $\Lambda$

Soriano, Jorge F., Wohlberg, Shimon, Anchordoqui, Luis A.

Understand

The proposal for a sudden sign-switching cosmological constant $\Lambda$ in the local universe, emulating a phase transition from anti-de Sitter (AdS) to de Sitter (dS) space, has markedly revamped the fit to observational data and lays out a propitious framework for ameliorating major cosmological tensions, such as the $H_0$ and $S_8$ tensions.

This proposal is widely known as $\Lambda_s$CDM.
We investigate the possibility that $\Lambda$ does not only flip sign at the transition but has also different curvature radii in the AdS and dS phases.
We show that the critical redshift of the transition $z_c$ is strongly correlated with the vacuum energy in the AdS phase $\Omega_{\Lambda_-}$, and that these two variables do not correlate strongly with the other cosmological parameters.