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The dynamics of black holes in the first galaxies
(Georgia Institute of Technology, 2017-05-11)
Black holes (BHs) as massive as 10^9 solar masses has been discovered at redshift z > 6, that is within one billion years after the big bang. It is believed that some seed black holes with large initial masses formed at ...
Observation of Astrophysical Neutrinos by IceCube
(Georgia Institute of Technology, 2013-09-16)
Even though cosmic rays were discovered more than 100 years ago, their origin remains a mystery. Neutrinos, product of cosmic ray interactions at or near the production site, are the best astrophysical messenger to find ...
Cosmic Information Theory and Analysis: IT from BIT, from BITs in IT
(Georgia Institute of Technology, 2011-11-30)
We consider the Universe to be fundamentally quantum and statistical, the many-paths/many-worlds story. This lecture uses Cosmic Information Theory and Analysis, CITA, as a unifying theme to explore the vast sweep of our ...
The Astrophysics of Black Hole Spin
(Georgia Institute of Technology, 2013-04-22)
In addition to providing vital clues as to the formation and evolution of black holes, the spin of black holes may be an important energy source in the Universe. Over the past couple of years, tremendous progress has been ...
How a Failed Astrophysics Major Became a Successful Science Writer
(Georgia Institute of Technology, 2019-03-12)
I knew from the time I was a very young child that I wanted to be an astronomer. The dream lasted until I got to college, where I learned to my dismay that I actually had no passion for doing what an astronomer does; what ...
Cosmic Rays: Alien Invaders from Outer Space
(Georgia Institute of Technology, 2013-12-02)
Cosmic rays are microscopic, charged particles that permanently bombard Earth from outer space. 100 years after their discovery their origin is still a mystery. It is also not clear how cosmic rays can obtain energies that ...
The Astrophysics of Supermassive Black Holes
(Georgia Institute of Technology, 2014-10-21)
Black holes are perhaps the most mysterious and enigmatic objects that one can imagine.
Their gravitational fields are so strong that light is unable to escape their
grasp, and even fundamental quantities such as space ...
Aeons Before the Big Bang?
(Georgia Institute of Technology, 2009-03-24)
There is much impressive observational evidence, mainly from the cosmic microwave background (CMB), for an enormously hot and dense early stage of the universe referred to as the Big Bang. Observations of the CMB are now ...
Planet Nine From Outer Space
(Georgia Institute of Technology, 2019-04-09)
At the outskirts of the solar system, beyond the orbit of Neptune, lies an expansive field of icy debris known as the Kuiper belt. The orbits of the individual asteroid-like bodies within the Kuiper belt trace out highly ...
Scaler System Testing in the HAWC Experiment
(Georgia Institute of Technology, 2010-05-12)
TeV gamma rays probe the non-thermal Universe in ways that are not possible at other wavelengths. The HAWC observatory, under construction in Mexico, will be able to analyze and survey the TeV sky more completely than any ...