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DTSTART;TZID=America/Chicago:20150416T154500
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DTSTAMP:20260611T141823
CREATED:20150310T152229Z
LAST-MODIFIED:20230207T161036Z
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SUMMARY:Colloquium: Sydney Chamberlin
DESCRIPTION:This special Physics department scheduled for Thursday 4/16/15 afternoon at 4 pm in Room 137.  Coffee and cookies are served at 3:45 pm in the same room.  Anyone is welcome. \nWhen Galaxies Collide: the road to gravitational wave detection with pulsar timing arrays\nSydney J. Chamberlin\, PhD Candidate\, UWM Dept. of Physics \nGravitational waves are small perturbations to the spacetime structure of the universe.  Predicted to exist by Einstein’s Theory of General Relativity\, the direct detection of gravitational waves is currently a major goal in experimental astrophysics.  At the low-frequency end of the detectable gravitational-wave spectrum\, pulsar timing arrays exploit the stability of millisecond pulsars to search for gravitational waves.  The gravitational waves in this frequency band are primarily generated by supermassive black hole binary systems\, which occur (for instance) when galaxies collide.  For a large number of such sources across the sky\, gravitational waves can incoherently combine to form a stochastic background of gravitational waves. \nIn this talk\, I will explain how pulsar timing arrays are used to search for gravitational waves\, and describe some of the progress being made towards the first detections\, with an emphasis on stochastic backgrounds.  I will also explain how future stochastic background observations can be used to robustly test general relativity in a manner that is unique to pulsar timing arrays.
URL:https://uwm.edu/physics/event/colloquium-sydney-chamberlin/
LOCATION:Physics 137\, 1900 E. Kenwood Blvd.\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
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DTSTART;TZID=America/Chicago:20150413T154500
DTEND;TZID=America/Chicago:20150413T170000
DTSTAMP:20260611T141823
CREATED:20150410T144935Z
LAST-MODIFIED:20230207T161028Z
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SUMMARY:Colloquium: Madeline Wade
DESCRIPTION:This special Physics department colloquium is scheduled for Monday 4/13/15 at 4:00 pm in Room 137.  Coffee\, tea and cookies are served at 3:45 pm in the same room.  Anyone is welcome. \nSearch for Gravitational Waves from Sub-solar Mass Binary Systems\nMadeline Wade\, UWM Physics PhD Candidate \n        The Laser Interferometer Gravitational-wave Observatory (LIGO) is a kilometer-scale\, ground-based interferometer designed to detect small perturbations in spacetime known as gravitational waves.  The next generation of LIGO detectors are close to completion and have already achieved the best sensitivity to date.  The advanced detector era promises to bring the first direct detections of gravitational waves.  Detectable gravitational waves will come from dramatic astrophysical events\, such as supernova explosions and binary black hole coalescences.  Even the most promising sources for gravitational-wave detections will produce minuscule perturbations in spacetime.  The challenge of detecting these signals involves extracting a very small signal from a lot of noise.  \n      I will introduce LIGO’s basic operations and discuss how we search LIGO data for gravitational-wave signals.   Specifically\, I will discuss a search for gravitational waves from sub-solar mass black hole binary systems.  Sub-solar mass black holes cannot have formed through stellar evolution given current theories.  Instead\, such black holes are thought to have formed from quantum fluctuations in the early universe.  This search not only seeks to detect gravitational waves from sub-solar mass binary systems\, but its development also benefits future searches for binary neutron star systems at design sensitivity.
URL:https://uwm.edu/physics/event/colloquium-madeline-wade/
LOCATION:Physics 137\, 1900 E. Kenwood Blvd.\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
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DTSTART;TZID=America/Chicago:20150402T151500
DTEND;TZID=America/Chicago:20150402T163000
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CREATED:20150401T191452Z
LAST-MODIFIED:20230207T160952Z
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SUMMARY:Condensed Matter Physics Talk: Alexey Suslov
DESCRIPTION:This Physics department Condensed Matter Physics Talk is scheduled for Thursday\, April 2\, from 3:30-4:30 pm in Room 137. Refreshments are served from 3:15-3:30 pm in the same room. \nAcoustic Studies of Two-Dimensional Structures with High Conductivity\nDr. Alexey V. Suslov\, National High Magnetic Field Lab\, Florida State University \nI will give a review of DC field facility at the National High Magnetic Field Laboratory and present a novel detector\, which I recently designed and built for ultrasonic experiments in High magnetic fields. I will describe our results obtained by the surface acoustic wave technique on two–‐dimensional (2D) structures with quantum Hall effect. We use this technique for studies of complex ac conductivity of 2D carriers. \nMeasurements on a p–‐GeSi/Ge/GeSi (p=6×10**11 cm–‐2) single quantum well were performed in tilted magnetic fields and revealed that the in-plane component of the magnetic field affects the g-factor and the cyclotron effective mass of the holes. \nOur studies of single 65nm quantum well AlGaAs/GaAs/AlGaAs structure (n=5×10**10 cm–‐2 and μ=8.5×10**6 cm2/Vs) were focused in the vicinity of the filling factor 1/5. In this region\, observed frequency dependence of the ac conductivity is of a resonance nature. Such a behavior of ac conductivity could be interpreted as manifestation of a pinning mode of a Wigner crystal.
URL:https://uwm.edu/physics/event/condensed-matter-physics-talk-alexey-suslov/
LOCATION:Physics 137\, 1900 E. Kenwood Blvd.\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Condensed Matter Physics Seminars
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DTSTART;TZID=America/Chicago:20150323T151500
DTEND;TZID=America/Chicago:20150323T163000
DTSTAMP:20260611T141823
CREATED:20150320T194541Z
LAST-MODIFIED:20230207T160925Z
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SUMMARY:Colloquium: Dr. Georg Essl
DESCRIPTION:This special Physics department colloquium is scheduled for Monday afternoon at 3:30 pm in Room 137.  Coffee and cookies are served at 3:15 pm in the same room.  Anyone is welcome. \nPhysical Modeling of Sound – From Structure-Preservation to Inaudible Sources\nDr. Georg Essl\, Assistant Professor\, University of Michigan \nHow can we simulate the physics of sound quickly?  This is the driving question for real-time simulation of physical sound.  In this talk\, I describe the development of structure-preserving ideas in the simulation of sound based on the history of transportation-based simulation methods called “waveguides.”  Waveguides are based on the surprising discovery from the late 1970s that the one-dimensional linear wave equation can be simulated extremely efficiently.  My own work raises the question of how we can generalize this particular discovery to higher dimensions and use the implied insights of retaining structural information of the solution space to create good numerical methods.  In this talk I will also discuss a class of simple yet unusual forms of excitation patterns that fall in the class of non-radiating sources.  We will discuss broad conditions that lead to such sources and constructive principles for how we can devise additional forms of “strange” excitations on wave equations that have the property of being either undetectable (inaudible) or that do not fit the standard expectations of radiation for typical sources.
URL:https://uwm.edu/physics/event/colloquium-dr-georg-essl/
LOCATION:Physics 137\, 1900 E. Kenwood Blvd.\, Milwaukee\, WI\, 53201\, United States
CATEGORIES:Physics Colloquia
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