Astrophysics Seminar

Astrolunch: Yehuda Hoffman

Tue, 14/03/2017 - 12:30 to 13:30

Title:
Cosmicflows, Bayesian inference, constrained simulations and the Local Universe
Abstract:
The association of ‘Near Field’ and ‘Cosmology’ rests on the implicit Copernican assumption that the near field constitutes a typical patch of the universe. A key question that needs to be addressed is how typical the near field is, and thereby how relevant it is to cosmology at large. Constrained simulations embody Near Field Cosmology in the realm of cosmological simulations and are used here to shed light on the problem.

Astrolunch: Elad Steinberg (HUJI)

Tue, 09/05/2017 - 12:30 to 13:30

Title: The tidal disruption of G2
Abstract: Recently a gas cloud, called G2, has been observed in the midst of being tidally disrupted in the center of our galaxy. I'll talk about recent advances in the understanding of the disruption process, obtained with analytic arguments coupled with simulations done with the RICH code.

astrolunch: Raja GuhaThakurta (UC Santa Cruz)

Tue, 16/01/2018 - 12:30 to 13:30

The SPLASH Survey of the Andromeda Galaxy
I will present results from our group's study of the Andromeda galaxy. Topics will include: M31's dynamical mass, bulk tangential motion and impending encounter with the Milky Way, dwarf satellite dynamics and stellar content, (sub)structure, kinematics, metallicity, and age of the stellar halo, dynamics of the stellar disk, rare stellar populations, etc. Our study is based on a combination of ground-based and HST photometry and Keck/DEIMOS spectroscopy.

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

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

Lecturer: William G. Unruh, University of British Columbia
Abstract:
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