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DTSTART;TZID=America/Chicago:20240308T153000
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DTSTAMP:20260614T163551
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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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DTSTART;TZID=America/Chicago:20180309T153000
DTEND;TZID=America/Chicago:20180309T163000
DTSTAMP:20260614T163551
CREATED:20180108T222253Z
LAST-MODIFIED:20180216T194152Z
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SUMMARY:Physics Colloquium: Professor Joachim Frank -- 2017 Nobel Laureate in Chemistry
DESCRIPTION:Professor Joachim Frank\, Columbia University \n\n\nNew Opportunities in Single-particle Cryo-EM: Mapping States in an Ensemble\, Trapping Short-lived States \n\nSingle-particle cryo-EM provides experimental access to large ensembles of biological molecules\, but current methods of analysis fall short of mining the rich information buried in the data sets.  In addition\, the length of time of sample preparation in the normal experimental setup precludes the investigation of short-lived states.  New methods of data analysis pioneered in a collaboration with Abbas Ourmazd’s group\, and new experimental methods for trapping of states with a life time of 10-1000 ms both offer opportunities for research that is more function-oriented than current methodology. \n—–\nAdditional seating avaialble in KIRC 1150
URL:https://uwm.edu/physics/event/physics-colloquium-joachim-frank/
LOCATION:Lapham 162\, 3209 N. Maryland Ave.\, Milwaukee\, 53211
CATEGORIES:Physics Colloquia
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DTSTART;TZID=America/Chicago:20170407T153000
DTEND;TZID=America/Chicago:20170407T163000
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CREATED:20170403T140424Z
LAST-MODIFIED:20170403T140456Z
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SUMMARY:Physics Colloquium: Keith Vanderlinde
DESCRIPTION:Cosmology\, Cell Phones & Video Games: Mapping Dark Energy with CHIME\nProf. Keith Vanderlinde\, Department of Astronomy & Astrophysics\, University of Toronto \nAmong the great surprises of modern cosmology was the discovery of Dark Energy\, which dominates the energy budget of the Universe and is driving the acceleration of its expansion rate. Decyphering its properties and nature will require novel measurements spanning vast swaths of the observable Universe. In this talk\, I will introduce the Canadian Hydrogen Intensity Mapping Experiment (CHIME)\, an ambitious project to study Dark Energy by tracing out 4 billion years of cosmic history\, using a purpose-built radio telescope at the Dominion Radio Astrophysical Observatory (DRAO) in B.C.’s Okanagan Valley. \nHydrogen Intensity (HI) mapping uses redshifted 21cm emission from neutral hydrogen as a 3D tracer of Large Scale Structure (LSS) in the Universe.  Imprinted in the LSS is a remnant of acoustic waves which propagated through the primordial plasma of the nascent cosmos.  This “Baryon Acoustic Oscillation” (BAO) feature\, which appears as a spatial correlation of LSS\, can be used as a standard ruler to trace the expansion history of the Universe\, thereby allowing us to constrain the Dark Energy equation of state. \nCHIME is a transit interferometer with no moving parts\, which uses a massive computing backend to image the radio sky from 400-800MHz\, corresponding to 21cm radiation emanating from a redshift range of 0.8 < z < 2.5.  Earth rotation sweeps its field of view across the sky\, resulting in complete daily coverage of the northern celestial hemisphere and an unprecedented survey sensitivity.  I will discuss the motivation\, design\, and progress on CHIME and its reduced-scale Pathfinder\, as well as a pair of extensions which will probe the high-cadence time-domain radio sky\, monitoring radio pulsars and exploring a more recent mystery in radio astronomy\, the possibly-cosmological Fast Radio Bursts.
URL:https://uwm.edu/physics/event/physics-colloquium-keith-vanderlinde/
LOCATION:Lapham 162\, 3209 N. Maryland Ave.\, Milwaukee\, 53211
CATEGORIES:Physics Colloquia
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DTSTART;TZID=America/Chicago:20151015T153000
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LAST-MODIFIED:20230119T212446Z
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SUMMARY:CGCA Seminar: Rob Hodyss
DESCRIPTION:This special CGCA (The Leonard E. Parker Center for Gravitation\, Cosmology and Astrophysics) seminar is scheduled for Thursday 10/15/15 at 3:30 pm in Lapham 162. \nOrganic Chemistry on Titan\nRob Hodyss\, Jet Propulsion Laboratory\, California Institute of Technology \nThe Cassini-Huygens mission has revealed Saturn’s largest moon Titan to be a remarkably Earth-like world\, with a diverse landscape of rivers\, lakes and seas\, vast dune fields\, plains and mountains. Unlike Earth\, however\, Titan’s visible surface is dominated by solid organic materials at cryogenic temperatures\, and altered by the action of liquid methane and ethane.\nOur work at JPL focuses on understanding the fundamental chemical processes that lead to this varied landscape. Dissolution and solubility of solid organics in the lakes and seas leads to erosion of Titan’s surface. The precipitation of dissolved materials as the lakes dry can result in organic evaporite deposits\, which may contain novel crystalline forms only possible at cryogenic temperatures.\nEven at Titan’s low surface temperature (94 K)\, rapid chemical reactions are still possible. We are studying the reaction of carbon dioxide with primary amines to form carbamic acids\, a reaction that occurs relatively rapidly at temperatures as low as 40 K. Titan’s assorted environments and array of organic molecules are intriguing as a venue for prebiotic chemistry\, and make Titan an important target for future astrobiology missions.
URL:https://uwm.edu/physics/event/cgca-seminar-rob-hodyss/
LOCATION:Lapham 162\, 3209 N. Maryland Ave.\, Milwaukee\, 53211
CATEGORIES:CGCA Seminars
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