Speaker
Nathan Cruickshank
(University of Portsmouth)
Description
Interactions between dark energy and dark matter offer a potential solution to cosmological tensions. Specifically, models characterised by pure momentum exchange have been suggested to alleviate the S8 tension, as they lead to a suppression in structure growth rate at late times. In this talk, I will discuss how the choice of dark energy model impacts the ability of future data releases to constrain the coupling strength of these interactions. I show that to obtain robust constraints, it is crucial to account for dark energy perturbations when computing the linear matter power spectrum, particularly in the limit where the equation of state w approaches -1.