Cosmology seminar: David Kaplan

David Kaplan is an associate professor at the University of Wisconsin, Milwaukee.

The Geometry, Energetics, and Environment of the Binary Neutron Star Merger GW170817: The Radio View

I will discuss the major uncertainties regarding the geometry, energetics, and environment of the first EM/GW binary neutron star merger GW170817.  In particular I will look at the origin of the radio emission, how it differs from the early-time optical/infrared emission, and what that tells us about how the explosion proceeded.  I will show how constraints from the radio  lightcurve, polarization, and Very Long Baseline Interferometry helped provide evidence for a broad, mildly relativistic "cocoon" along with a narrow jet.  This broke degeneracies in the gravitational wave data analysis to provide inclination constraints and improved  measurements of the Hubble Constant.


Emil Rivera-Thorsen
Tags: Gravitational waves, cosmology, multi-messenger observation
Published Dec. 7, 2018 10:54 AM - Last modified Dec. 7, 2018 11:00 AM