Séminaire Univers / |
| « Cosmic tensions in the dark sector » |
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Elsa Texeira |
| The standard Lambda Cold Dark Matter (?CDM) cosmological model has proven remarkably successful in describing a broad range of observational data, ranging from the CMB to the large-scale structure of the Universe. However, recent advances in precision cosmology have revealed persistent statistical discrepancies between independent data sets and observational methods. One prominent example is the "Hubble tension," which refers to the irreconcilable predictions of the present expansion rate of the Universe when inferred from early-Universe measurements (such as the CMB) compared to local observations. In this talk I will review the status of the Hubble tension and explore whether it can be explained by late-time physics in the dark sector, focusing on models with dark matter–dark energy interactions. Leveraging on phenomenological considerations and fluid descriptions of the dark sector, I will assess which classes of models can alleviate current cosmological tensions while remaining consistent with existing data. |
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mardi 20 janvier 2026 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |