Speaker
Description
Our current perturbation theory techniques for predicting the power spectrum break down when we enter the non-linear regime (k~0.1 h/Mpc). Simulations allow us to probe this regime, however one must be run for every cosmology and gravity model one wishes to constrain. A perturbation theory technique that could push further into the non-linear scales than current methods and match the accuracy of a simulation would be more economical. I will present a trajectories approach to modelling the non-linear power spectrum (Lane et al. 2019, in prep) building on previous results. This technique can be described as performing a simulation on paper and could match current predictions of the non-linear power spectrum from simulations. I will discuss how this method performs versus current perturbation theory techniques and how previous results obtained with this method can be improved upon. I will also show how an analytic expression for the power spectrum can be obtained and use this to compare the technique to simulations.
