Contributed Talk - Splinter Computation

Thursday, 24 September 2020, 10:20   (virtual room B)

Influence of local environment on weak lensing statistics

Md Rasel Hossen, Sonia Akter Ema, Krzysztof Bolejko, Geraint F. Lewis
Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, Australia

We study the impact of our local environment on the cosmological weak lensing convergence, shear and magnification with relativistic N-body simulation. Our simulation considers all relevant corrections from the general relativity in the evolution of cosmic large scale structure. We develop an innovative ray tracing code that incorporates the design of the ray bundle method, and integrate the null geodesics backwards from the observer to the sources to obtain the path of the photon. In this thesis, our main emphasis is to find out the local environment effects on the probability distribution functions of the weak lensing convergence,shear and magnification, and their corresponding angular power spectrum and bispectrum. We have observed that observers location within the local environment affects a few percent level precision in the measurement of the weak lensing statistics. Thus, impact of the local environment will be important when analyzing data from future surveys such as Euclid, which aim at the percent-level precision.