Speaker: Yuting Wang

Abstract:

The interacting vacuum energy model is a minimal extension of the LCDM model, where dark matter is allowed to interact with vacuum energy. An interaction between the vacuum energy and dark matter provides a way to alleviate the coincidence problem in the LCDM model. Since the coupling can influence the evolutions of both the background and linear perturbations, it may offer a way of solving the tensions in the measurements of e.g. H0, from CMB and other observations. Considering a given parametrised interaction with a constant coupling parameter, we present the constraint results using different data combinations. Extending to a general prescription for the interaction, we reconstruct the temporal evolution of the coupling strength in a non-parametric Bayesian approach using combined data sets.