Topical Seminar: "Investigating cosmological tensions in low and high redshift observational data"

por Dr. Ruchika Kaushik (University of Rome)

miércoles 22 feb. 2023 12:00 → 13:00 Europe/Madrid

1001-Primera-135 - Nave Exp. Sala de Audiovisuales (Universe)

Abstract: The concordance model ΛCDM being the simplest six-parameter model can explain most of the observations from CMB to the growth of large-scale structures and to the acceleration of the present universe. But a few recent observations have indicated inconsistencies in the cosmological credibility of model ΛCDM. One such observation in tension which is now confirmed to be more than five sigmas is "Hubble Tension". In this talk, I will talk about how early Universe solutions may not be enough to solve the Hubble Tension. Then I would go on to discuss that cosmological data suggests the possibility of a negative cosmological constant plus an evolving dark energy component at late times and this model can explain the present tensions and predicts the enhancement in the growth of structures at comparatively higher redshifts as seen in present JWST observations.