Speaker: Marco Bruni
Location: plenary talk at the meeting Dark Side of the Universe 2014, Cape Town http://www.acgc.uct.ac.za/dsu2014/
Measurements of anisotropies of the CMB, combined with independent measurements of the cosmic expansion history, such as baryon acoustic oscillations, have provided strong support for the standard model of cosmology, the ΛCDM model. However the latest measurements are in tension with local measurements of the Hubble expansion rate from super- novae Ia and other cosmological observables which point towards a lower growth rate of large-scale structure (LSS), including cluster counts from Sunyaev-Zel’dovich and X-ray observations and redshift-space distortions (RSD) from galaxy peculiar velocities. In this talk I will discuss a minimal generalisation of the ΛCDM model, where vacuum and CDM can interact at late time, showing that this model alleviate this tension.