Naoki Yoshida (University of Tokyo): The Dark Age of the Universe скачать в хорошем качестве

Naoki Yoshida (University of Tokyo): The Dark Age of the Universe

Recent observations by James Webb Space Telescope discovered a number of distant galaxies that existed when the age of the Universe was just several hundred million years. The observational frontier is advancing toward exploring when the first stars and galaxies were formed, and even further back in time to when no luminous objects yet existed. We first review the physical cosmology focusing on the epoch called the Dark Age. A promising observational probe is the hydrogen 21cm line, and a number of observational efforts are underway, including those based on the far-side of the moon. We use state-of-the-art cosmological simulations with hydrodynamics, non-equilibrium chemistry and radiative transfer, to study in detail how small-scale structure develops in the early universe. Outstanding questions in the formation of the first stars and blackholes are discussed. Finally, we forecast for future low-frequency radio observations to probe the Dark Age and Cosmic Dawn and to test the standard cosmological model.