Improving on numerical simulations of nonlinear CMB anisotropies

Spanish Relativity Meeting: almost 100 years after Einstein's revolution

Fullana I Alfonso, Màrius Josep^1 ; Arnau I Córdoba, Josep Vicent^2 ; Thacker, Robert J.^3 ; Couchman, Hugh M.P.^4 ; Milán, Diego P. Sáez^5

IMM, Universitat Politècnica València, Camí de Vera, s/n, València

46022, Spain^1

DMA, Universitat de València, Dr. Moliner 50, Burjassot

46100, Spain^2

DAP, St. Mary's University, Halifax

NS

B3H 3C3, Canada^3

DPA, McMaster University, 1280 Main St. West, Hamilton

ON

L8S 4M1, Canada^4

DAA, Universitat de València, Dr. Moliner 50, Burjassot

46100, Spain^5

关键词: Cosmic microwave background anisotropies;    Non-linear anisotropy;    Particle densities;    Particle particle particle meshes;    Resolution improvement;    Weak lensing;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/600/1/012027/pdf
DOI  :  10.1088/1742-6596/600/1/012027

来源: IOP

【 摘 要 】

An Adaptative-Particle-Particle-Particle-Mesh code (HYDRA) plus a ray-tracing procedure was used in [1] to perform an exhaustive analysis of the weak lensing anisotropy. Other nonlinear Cosmic Microwave Background anisotropies, such as the Rees-Sciamaand the Sunyaev-Zel.dovicheffects are also being studied by using the same tools. Here we present some advances in our study of these nonlinear anisotropies. The primary advance is due to the use of better simulations with greater particle densities and appropriate softening, although other parameters have also been adjusted to get better estimates. Thus, we improve on a previous paper [2] where the Rees-Sciamaeffect was studied with Particle-Mesh simulations. We focus particular attention on the resolution improvement and its consequences.