Astrophysics Seminar

Physics Colloquium (Bekenstein Memorial Lecture): "Black Holes in the Laboratory"

Levin building, Lecture Hall No. 8
Mon, 08/01/2018 - 12:00 to 13:30

Lecturer: William G. Unruh, University of British Columbia
Black holes, one of the most surprizing and contentious of the predictions of
Einstein's theory of gravity, have puzzled physicists for the past
century. While the classical aspects were cleared up about 50 years ago, that
was also when the quantum surprize, discovered by Hawking, occured. Are black
holes black, or do they glow? Understanding this puzzle was one of both Jacob
Bekenstein's and my life's work. In 1981 I argued that at least some parts of

Astro seminar: Anastasia Fialkov (Harvard)

Sun, 07/01/2018 - 14:30 to 15:30

Title: Tracing cosmic dawn
The first billion years of cosmic history hold the key to unlocking many of the remaining mysteries in
astronomy, cosmology and physics. However, due to the lack of direct observations, we know almost
nothing about the objects (the first stars, galaxies, and quasars) that form at that time. Fortunately,
groundbreaking international projects that span the electromagnetic spectrum are soon to come on line, e.g.
the Square Kilometer Array (SKA; radio), the James Webb Space Telescope (JWST; infrared),

astrolunch: Ilya Gurwich (BGU)

Tue, 12/12/2017 - 12:30 to 13:30

Title - Modeling the Fermi Bubbles and Galactic Haze
Abstract -
We measure the spectrum of the Fermi bubble (FB) edges without the use of template reduction.
The edge spectrum exhibits a tilt compared to the bulk of the FBs, which we argue results from the diffusion of cosmic rays away from the edges and into the bubbles.
We also show that the FB edges can be observed not only in gamma-rays but in radio and X-rays as well.
Using these multi-messenger observations we identify the FB edges as a forward shock.