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CREATED:20250206T135847Z
LAST-MODIFIED:20250218T185503Z
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SUMMARY:Physics Colloquium - Geoffrey Bower
DESCRIPTION:Geoffrey Bower\, Chief Scientist for Hawaii Operations\, Academia Sinica Institute of Astronomy and Astrophysics\, Project Scientist\, Event Horizon Telescope Collaboration\, Affiliate Graduate Faculty\, University of Hawaii-Manoa\, Dept. of Physics and Astronomy \nImaging Black Holes with the Event Horizon Telescope \nThe Event Horizon Telescope (EHT) is a global submillimeter-wavelength very long baseline array that produces the highest angular resolution images of black holes. The EHT Collaboration has produced images of two black holes\, the supermassive black hole in the elliptical galaxy M87 and the Galactic Center black hole\, Sgr A*. \nIn this talk\, I will describe the techniques and technology behind these measurements\, give updates on the latest results\, and plans for future observations. Images of both sources have a ring-like morphology consistent with predictions of general relativity and the Kerr metric. Comparison with an unprecedented library of GRMHD simulations provides insights on the accretion and outflow properties. These results confirm that the gravitational lensing feature is a universal property of black holes\, establishes the consistency of general relativity over three orders of magnitude in mass\, and opens the door for future tests of gravitational physics\, accretion\, and jet formation. \nThe event flyer is available here.
URL:https://uwm.edu/physics/event/physics-colloquium-geoffrey-bower/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
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CREATED:20250225T151409Z
LAST-MODIFIED:20250227T162945Z
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SUMMARY:Physics Colloquium - David Hogg
DESCRIPTION:David Hogg\, Professor of Physics & Data Science\, NYU \nSailing as Momentum Transport \nSailboats represent an ancient (but newly relevant) sustainable form of transportation. They work off the relative velocity between the air and the water. Sailboats can sail upwind (by tacking)\, they can sail downwind faster than the wind (also by tacking)\, and they can sail crosswind much faster than the wind. \nI present the simplest possible momentum transport model of a sailboat\, and explain all of these capabilities. In this (spherical scow) model\, the sailboat is defined by three dimensionless numbers: the sail-to-keel area ratio\, a lift ratio for the sail\, and a lift ratio for the keel. The model makes a number of amusing “predictions” that explain the properties of commercial and competitive sailboats. There are many connections to sustainable energy. \nThe event flyer is available here.
URL:https://uwm.edu/physics/event/physics-colloquium-david-hogg/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
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