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Wednesday, January 29, 2020 11:30 am - 11:30 am EST (GMT -05:00)

Rapidly Spinning Neutron Stars and the Equation of State of Dense Matter

Astronomy Seminar Series

Sharon Morsink

Neutron stars are tiny stars with ultra-strong magnetic and gravitational fields and densities larger than nuclear. Their small size and large average densities allow them to spin at very rapid rates, with surface velocities that are a large fraction of the speed of light.

Friday, February 7, 2020 10:30 am - 10:30 am EST (GMT -05:00)

New Views of Galaxy Cluster Laboratories

CANCELLED

Astronomy Seminar Series

Brenda Frye, University of Arizona

Galaxy clusters as astronomical tools generally offer two advantages:  to boost the brightnesses of objects in the background, and to study the dark matter in the lens.  We can now introduce a third use: to unveil properties of the underlying dark matter by the detection of caustic crossing events which can yield magnification factors of 10,000 or more.  We review the approach to detect a new set of massive objects such as galaxy clusters by their rest-frame far-infrared colors (and not by th

Wednesday, February 12, 2020 11:30 am - 11:30 am EST (GMT -05:00)

Super-Eddington Accretion

Astronomy Seminar Series

Ramesh Narayan, Harvard University

Accretion disks around black holes are the power source behind many luminous and powerful astrophysical systems, for example, X-ray binaries and active galactic nuclei. The well-known thin disk model does a good job of explaining many accreting black hole systems, but the model is limited to sub-Eddington accretion rates. Can a black hole accrete at a super-Eddington rate? If yes, do we observe such systems, and do they have unique observational signatures?

Wednesday, February 19, 2020 11:30 am - 11:30 am EST (GMT -05:00)

Astrostatistics in the Era of Large Surveys: from the Milky Way to individual stars

Astronomy Seminar Series

Gwen Eadie, University of Toronto

Astrostatistics is an interdisciplinary field that lives on the boundary between astronomy and statistics. This interdisciplinary field seeks to answer fundamental science questions about the universe while simultaneously inspiring new and improved statistical methods for data analysis. In this talk, I will introduce two areas of my research in astrostatistics. The first covers hierarchical Bayesian analysis in the context of the Milky Way Galaxy, applied to data from the Gaia satellite and others.

Wednesday, February 26, 2020 11:30 am - 11:30 am EST (GMT -05:00)

Self-regulation of star formation rates and launching of multiphase galactic winds from first principles simulations

Astronomy Seminar Series

Chang-Goo Kim, Princeton University

Developing a theoretical understanding of star formation and galactic-scale winds from first principles is the major hurdle to build a truly predictive galaxy formation theory. Stars are born in the interstellar medium (ISM) as a consequence of the competition between gravity and turbulent, magnetic, and thermal pressure forces.

Wednesday, March 18, 2020 11:30 am - 11:30 am EDT (GMT -04:00)

It Came From the Swampland

CANCELLED

Astronomy Seminar Series

Will Kinney, University of Buffalo, SUNY

Recent developments in String Theory center on the idea of the "Swampland", which is defined as the set of low-energy effective theories which do not have any counterpart in a complete theory of quantum gravity. I will provide a pedagogical introduction to the Swampland concept, with a particular focus on implications for cosmology. There may be some snark.

Tuesday, September 22, 2020 12:30 pm - 12:30 pm EDT (GMT -04:00)

Where do the patterns in the standard model come from?

Phys10 Undergraduate Seminar Series - on Teams

Latham Boyle
Perimeter Institute for Theoretical Physics

Over the past half-century, physicists have established the "standard model" of particle physics, which does a spectacular job of passing (nearly) all of the tests to which it has been subjected.  But some of the most basic patterns in this model remain unexplained.  Dr. Latham Boyle will introduce a few of these patterns, and some ideas for how to understand them, along with relating to a remarkable mathematical object called "exceptional Jordan Algebra".