Astro Seminar Series - VIA ZOOM

Wednesday, January 13, 2021 11:30 am - 11:30 am EST (GMT -05:00)

Jolien Creighton
Jolien Creighton is a Professor of Physics at the University of Wisconsin–Milwaukee.  He got his PhD at the University of Waterloo studying black hole thermodynamics.  He then did a postdoc at the California Institute of Technology where he became involved in LIGO data analysis.  He moved to the University of Wisconsin–Milwaukee where he was first a postdoc and then joined the faculty.  For the past four years he has co-chaired the LIGO Scientific Collaboration’s Compact Binary Coalescence working group which analyzes LIGO data to detect gravitational waves produced by merging black holes and neutron stars and to use these observations to determine the source properties.  His interests include measuring the rate binary mergers and the and mass distribution of the components, determining the equation of state of neutron stars, using binary coalescences as standard sirens for determining cosmological parameters, testing general relativity through gravitational wave observations, and observing gravitationally-lensed gravitational wave signals.

Talk title and abstract:

5 Years of Gravitational Wave Astronomy

The first direct detection of gravitational waves was made a little over 5 years ago (about 1 graduate student generation).  The LIGO and Virgo Collaboration (which now includes KAGRA too) has recently updated their catalog of merging binaries of black holes and neutron stars: the catalog now contains a total of 50 events.
In this talk I will give an overview of what gravitational waves are and how we observe them.  I will discuss the discoveries made over the past 5 years and how they help us learn about fundamental physics (tests of relativity; state of dense matter), astrophysics (origin of neutron star and black hole binaries; origin of certain elements), and cosmology.

Would you like to join this Zoom seminar?  Please email Donna Hayes.