ABSTRACT
The current standard model for cosmology, the Lambda Cold Dark Matter cosmology with a power-law primordial power spectrum, enjoys enormous success in explaining the large scale structure of the universe.
However, recently James Webb Space Telescope reveals an unexpectedly large number of massive galaxies forming at high redshifts. Along with the strong lensing and nearby dwarf galaxy observations, there are still various challenges to this standard model at small scale (< 1 Mpc).
In this talk, I will address these recent challenges to the standard model, including the mismatch between simulated and observed satellite population, as well as the central density of dwarf galaxies. I will explore the complex interplay between dark matter, baryons, and primordial power spectrum, which complicates the direct constraints to the cosmology models. I will discuss the possible pathway to break this degeneracy by combining theories, simulations, and various observations.
BIOGRAPHY
Prof. Tsang Keung Chan is an assistant professor in Physics at the Chinese University of Hong Kong. He was an Inaugural Margaret Burbidge Fellow at the University of Chicago, and a post-doctoral research associate at the Institute of Computation Cosmology, Durham University. He earned his PhD in physics at the University of California, San Diego.
His research interests center around astrophysical simulations of the universe, stars, galaxies, and dark matter. By comparing his numerical simulations with observations, he aims to unveil the nature of dark matter, inflation, and the underlying processes of galaxy formation.
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