Analysis of Line Intensity Mapping, Dust Grain Radiation, Lyman-α Emission and Transmission

Abstract

Existing models of the universe consider the combined effects of neutrons and dark matter. While the properties of neutrons are well understood, depicting galaxy formation and understanding the universe through spectral images remains a major research direction. This study can be classified into two disciplines: Cosmology and Astrophysics. Astrophysicists focus on the evolution of galaxies, while cosmology studies the universe on a larger scale, including interactions of dark matter and dark energy. Cosmologists mainly obtain data through cosmological simulations, which play an important role in cosmology research. However, existing computers struggle with the complex calculations involved. One possible solution is simulating cosmic fluid dynamics, which can effectively simulate large volumes but cannot simulate detailed information. The THESAN project has achieved important research results but also has some defects. Existing articles have summarized THESAN's characteristics and shortcomings by comparing its expected simulations with observational data. This paper summarizes the existing problems and introduces solutions, focusing on THESAN's improved simulation method for the Lyman-alpha emission spectrum and its simulation of cosmic dust. We talk about 3 new techniques used in the simulation of THESAN.