Towards accurate modelling of the integrated Sachs-Wolfe effect: the non-linear contribution
Towards accurate modelling of the integrated Sachs-Wolfe effect: the non-linear contribution
In a universe with a cosmological constant, the large-scale gravitational potential varies in time and this is, in principle, observable. Using an N-body simulation of a $\Lambda$CDM universe, we show that linear theory is not sufficiently accurate to predict the power spectrum of the time derivative, $\dot{\Phi}$, needed to compute …