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DTSTART;TZID=America/Chicago:20240301T153000
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DTSTAMP:20260610T155834
CREATED:20240220T150216Z
LAST-MODIFIED:20240220T150216Z
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SUMMARY:Physics Colloquium - Sarah Vigeland
DESCRIPTION:Searching for a Gravitational Wave Background with Pulsar Timing Arrays \nSarah Vigeland\, Asst. Professor\, Dept. of Physics\, UW-Milwaukee\nPulsar timing arrays use observations of millisecond pulsars to detect nanohertz gravitational waves.  The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) Collaboration has recently released their 15-year data set containing observations of 68 millisecond pulsars.  These data contain evidence for Hellings-Downs correlations\, which are characteristic of a gravitational wave background.  \nIn this talk\, I will present these results\, and discuss the spectral properties of the signal and implications for the astrophysical source. I will also discuss prospects for detecting other types of gravitational wave sources with pulsar timing arrays\, including individual supermassive binary black holes. \nThe event flyer is available here.
URL:https://uwm.edu/physics/event/physics-colloquium-sarah-vigeland/
LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=KIRC 1150 3135 N. Maryland Ave. Milwaukee WI 53211 United States;X-APPLE-RADIUS=500;X-TITLE=3135 N. Maryland Ave.:geo:-87.8839451,43.0754962
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DTSTART;TZID=America/Chicago:20240308T153000
DTEND;TZID=America/Chicago:20240308T170000
DTSTAMP:20260610T155834
CREATED:20240226T180637Z
LAST-MODIFIED:20240228T194456Z
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SUMMARY:Physics Colloquium - Alan Wiseman
DESCRIPTION:The Self-force on Static and Dynamic Charges in Schwarzschild Spacetime Using the Method of Images \nAlan Wiseman\, Assoc. Professor\, Dept. of Physics\, UW-Milwaukee\nOne of the most basic examples of a self-force phenomenon (sometimes called the radiation reaction force) is that of a small\, charged particle near a large spherical mass such as a Schwarzschild black hole.  If the particle is held stationary\, there are novel electrostatic forces on the particle. If the particle is orbiting the mass\, the fields created by the particle back-react on the particle and cause it to depart from its otherwise free-fall motion. There are many ways to solve for the forces and motion in these circumstances\, but past solutions have involved considerable technical machinery\, and the results are messy and “non-intuitive”.  \nI will take a fundamentally new approach to this problem using the method of image charges. This approach makes the origin of the forces easier to visualize.  In the talk\, I will make a clear analogy between this new work and that of familiar examples of the method of images in electrostatics. \nThe event flyer is available here.
URL:https://uwm.edu/physics/event/physics-colloquium-alan-wiseman/
LOCATION:Lapham 162\, 3209 N. Maryland Ave.\, Milwaukee\, 53211
CATEGORIES:Physics Colloquia
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GEO:43.0757204;-87.8840564
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Lapham 162 3209 N. Maryland Ave. Milwaukee 53211;X-APPLE-RADIUS=500;X-TITLE=3209 N. Maryland Ave.:geo:-87.8840564,43.0757204
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DTSTART;TZID=America/Chicago:20240329T153000
DTEND;TZID=America/Chicago:20240329T170000
DTSTAMP:20260610T155834
CREATED:20240311T212140Z
LAST-MODIFIED:20240311T212140Z
UID:10435337-1711726200-1711731600@uwm.edu
SUMMARY:Physics Colloquium - Gabor Csathy
DESCRIPTION:Professor Gabor Csathy\, Department of Physics and Astronomy\, Purdue University \nEmergent Particles and Topology in Flat Landau Bands \nElectronic systems with flat energy bands support a variety of topological phases of current interest.  The two-dimensional electron gas in the fractional quantum Hall regime is such a system.  Ground states of this system found an elegant description in terms of emergent particles called composite fermions.  \nIn this talk we review the topological ground states and some of their basic properties and discuss two recent discoveries: fractional quantum Hall states associated with flux-six composite fermions and a bubble phase of composite fermions. \nThe event flyer is available here.
URL:https://uwm.edu/physics/event/physics-colloquium-gabor-csathy/
LOCATION:KIRC 1150\, 3135 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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