Imprints of Heavy Inflationary Particles on the Large Scale Structure

Nov 17, 2022, 9:30 AM
30m
The Grand Sumorum, Jeju

The Grand Sumorum, Jeju

114, Maksukpo-ro, Seogwipo-si, Jeju Special Self-Governing Province (1513, Beophwan-dong)

Speaker

Jeong Han Kim (Chungbuk National University)

Description

The early universe had such an extremely high energy density that
supermassive particles could have been produced. When heavy particles are pair
produced during inflation via couplings to the inflaton, the particle mass generates
a non-trivial curvature perturbation in position space. Even if the heavy particles no
longer exist, the modified curvature perturbations are preserved before horizon
re-entry and will generate locally-enhanced dark matter clumps or galaxy densities
on the large-scale structure. We explore these signatures by studying the matter
power spectrum and the abundance of massive halos, and discuss the discovery
potential. We will go through the details of implementing the curvature
perturbations in the N-body simulations with appropriately modifying initial
conditions, and talk about several subtleties that we are currently coping with. It will
allow us to properly include non-linear effects, and investigate a pairwise nature of
signals which is difficult to study analytically. Finally, I will briefly introduce other
interesting literatures that explore early universe models with using N-body
simulations, and their general aspects.

Presentation materials