PASCOS 2026

Cosmological signatures of a solidly unified dark sector

Not scheduled

20m

Richard Roberts Auditorium

Contributed Talk

Speaker

María Pérez Garrote (Universidad de Salamanca)

Description

I will present a cosmological model with a unified solid dark sector that transits from a CDM phase at high redshift to a quasi-de Sitter phase at late times. Remarkably, this can be accomplished without generating strong acoustic oscillations, thus being compatible with observations of the matter power spectrum. The solid unified dark sector can reduce the rate of matter clustering in the late universe compared to the standard $\Lambda$CDM scenario, providing potential ways to alleviate the σ8 tension. A distinctive signature of the model is the generation of a non-trivial slip parameter that could be imprinted in weak lensing measurements. Additionally, gravitational waves acquire a nonvanishing mass term due to the shear distortions.