# Beyond General Relativity, Beyond Cosmological Standard Model

1-5 July 2019
Faculty of Physics, University of Warsaw
Europe/Warsaw timezone

## Constraining the interacting vacuum scenario

Not scheduled
20m
Faculty of Physics, University of Warsaw

#### Faculty of Physics, University of Warsaw

conference hall 0.03, Faculty of Physics, University of Warsaw ul. Pasteura 5, 02-093 Warszawa Poland
Poster session

### Speaker

Ms Natalie Hogg (Institute of Cosmology and Gravitation)

### Description

It is well-known that there are problems with the standard model of cosmology that hint at possible physics beyond the $\Lambda$CDM paradigm. In particular, the 4$\sigma$ tension in the values of $H_0$ coming from CMB and supernovae measurements is motivation enough to consider alternative cosmological models.

In this talk, I will introduce one such model, the interacting vacuum scenario. Beginning with the covariant theory of the interaction, I will show the linear theory of perturbations in the scenario before specialising to the spatially flat FLRW background. I will describe how the interaction parameter can be constrained using MCMC methods and show the results of our investigation for both a constant and a dynamical interaction, focusing on the effects of the interaction on the cosmological tensions.

### Primary author

Ms Natalie Hogg (Institute of Cosmology and Gravitation)

### Presentation Materials

There are no materials yet.