Non-linear dark energy simulations

          @misc{ pirsa_PIRSA:24070042,
            doi = {10.48660/24070042},
            url = {https://pirsa.org/24070042},
            author = {Kunz, Martin},
            keywords = {Cosmology, Strong Gravity, Mathematical physics},
            language = {en},
            title = {Non-linear dark energy simulations},
            publisher = {Perimeter Institute},
            year = {2024},
            month = {jul},
            note = {PIRSA:24070042 see, \url{https://pirsa.org}}
          }
          

Abstract

The coming years will see an amazing increase in data on the large-scale structure of the Universe, ushering in a new phase for "precision cosmology". One of the major questions in fundamental physics concerns the nature of the dark energy, and the new data may help to shed light on this issue. But in order to unlock the full power of the future data to test alternative models like Horndeski Gravity, we need theoretical predictions that are as accurate as the new observations on all scales, including non-linear scales. In my presentation I will introduce our relativistic N-body code for cosmological simulations, gevolution, and how we are using it to look at non-linear effects in the Universe. In particular I will discuss our k-essence simulations, how to use them for cosmology, and what can happen when dark energy clustering becomes non-linear in models with low speed of sound.