Workshop "Towards Accurate Lightcones for Cosmology"

Session

day 1 morning session 2

18 Oct 2016, 11:00

MIAPP Building, Seminar Room (Excellence Cluster Universe, Garching)

6. An Algorithm for the Generation of Continuous Light Cones in Simulations

Dr Joachim Stadel (University of Zurich)

18/10/2016, 11:00

I will discuss the method employed in our recent 2 trillion particle simulation for generating a light cone where the look-back time and comoving distance from the observer is an exact linear function for every particle. While such an approach may seem to be extremely costly at face value, it turns out to be quite efficient for reasonably large cosmological volumes. I will also discuss...

1. Ray-Ramses: a code for ray-tracing on the fly with N-body simulations (1601.02012)

Mr Sownak Bose (Institute for Computational Cosmology)

18/10/2016, 11:30

We present a ray tracing code to compute integrated cosmological observables on the fly in AMR N-body simulations. Unlike conventional ray tracing techniques, this code takes full advantage of the time and spatial resolution attained by the N-body simulation by computing the integrals along the line of sight on a cell-by-cell basis through the AMR simulation grid. Moreover, since it runs on...

5. An alternative route for high order lensing

Dr Claudio Llinares (Durham University)

18/10/2016, 12:00

While doing predictions for gravitational lensing using first order equations greatly simplifies the calculations, it has been shown that the approximations involved can not reach the accuracy required by the next generation of galaxy surveys. Second order effects must be included in lensing predictions. Since this is new territory, it is important that we do not focus only on one technique,...