Скачать или смотреть Mapping the Cosmic Dark Ages from the Lunar Far Side by Jonathan Pober

The so-called Cosmic "Dark Ages" -- the period in our Universe's history after the release of the Cosmic Microwave Background (CMB) and before the formation of the first stars -- are nearly unobservable, given the complete lack of luminous sources that existed at the time. However, low-frequency radio observations can measure the distribution of hydrogen gas during this era, providing a look into this heretofore-yet-unseen period of cosmic history. The very long wavelengths (greater than 10 meters) associated with this signal cannot be observed from the ground due to the opacity of the earth's ionosphere, necessitating a space-based mission. In this talk, I will further describe the motivations for such an experiment and highlight the design considerations that will be required to make this ambitious project a reality.

Professor Pober works in the field of "21 cm cosmology" -- a program of research to observe neutral hydrogen from the early universe through its hyperfine 21 cm emission line. His interests include both the development of new radio astronomy techniques to make these observations possible, and the physics of early universe galaxy formation and cosmology that they probe. He is a member of the PAPER, MWA, and HERA experiments. He arrived at Brown in January 2016; prior to that he was a postdoctoral fellow at the University of Washington. He received his PhD from UC Berkeley in 2013. Prof. Pober was recently awarded a NASA Roman Technology Fellowship to study the feasibility of putting a radio telescope on the far side of the Moon.