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Events at Physics

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Events During the Week of September 20th through September 27th, 2020

Monday, September 21st, 2020

Plasma Physics (Physics/ECE/NE 922) Seminar
Using Fundamental Turbulence Saturation to Improve Fast Transport Frameworks
Time: 12:00 pm
Place: Zoom Meeting
Speaker: M.J. Pueschel, Dutch Institute for Fundamental Energy Research & Eindhoven University of Technology
Abstract: Present-day simulation approaches for fusion plasmas can be performed with an impressive degree of physics fidelity, such as covering the dynamics of all particle species and almost all of the plasma volume at the same time. However, at this level of realism, extending a simulation to a single plasma confinement time would likely require all of our annual available computing resources. For important tasks such as real-time control or confinement optimization, we therefore use reduced models that evaluate fluxes in seconds or less, key among which rank quasilinear, or mixing-length, transport models, sometimes in conjunction with neural networks. In this seminar, quasilinear models are explored and how one may use different techniques to improve their predictiveness. A particular focus lies on recent successes in using saturation theory in conjunction with turbulence simulations to design corrections to the model that allow it to capture flux scalings at high plasma beta and near the critical pressure gradient, in the so-called Dimits regime. The physics of both of these scenarios have long eluded modelers and theorists, and in providing a predictive framework, we are able to identify the underlying physical mechanisms responsible for the complex observed behavior, which is linked to the nonlinear excitation of linearly stable eigenmodes.

PAUL W TERRY is inviting you to a scheduled Zoom meeting.

Join Zoom Meeting

Meeting ID: 991 5610 7574
Passcode: 883688

Join by SIP
Join by H.323 (US West) (US East) (India Mumbai) (India Hyderabad) (Amsterdam Netherlands) (Germany) (Australia) (Singapore) (Brazil) (Canada) (Japan)
Meeting ID: 991 5610 7574
Passcode: 883688
Host: Paul Terry
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Tuesday, September 22nd, 2020

Graduate Program Event
PGSC Professional Development Event
Time: 2:30 pm
Speaker: Angela Zito (from the UW Writing Center), Justin Vandenbroucke, Victor Brar, Uwe Bergmann
Abstract: Tips and tricks for writing successful fellowship proposals. The Writing Center will give a short presentation on the components of and strategies for grant and proposal writing. Examples of successful graduate research proposals will be analyzed and discussed. Afterward, there will be a physics-specific discussion with professors in the department to tailor the tips to the specific funding agencies you may deal with.
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Network in Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS) Seminar
Microscopic black holes in neutrino telescopes, colliders and cosmology
Time: 3:30 pm
Speaker: Ningqiang Song , Queen’s University
Host: Baha Balantekin
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Wednesday, September 23rd, 2020

Physics ∩ ML Seminar
Science is a verb: adopting the scientific method and best practices in AI research
Time: 11:00 am
Place: Please register for this online event:
Speaker: Michela Paganini, Facebook AI Research
Abstract: While deep learning has been described as a largely empirical discipline, where practice leads theory, many of the approaches of machine learning research don’t appear to be grounded in the rigorous tradition of the empirical sciences. To understand the inner workings of deep networks at a fundamental level, these models ought to be studied like physical objects that follow specific dynamics governed by laws of motion, and examined with the tools of the scientific method, to ensure we not only understand effect, but also begin to understand cause, which is the raison d'être of science. In the context of AI fairness and pruning, I’ll show examples of how hypothesis testing, reproducible workflows, and careful experiment design can help validate or refute hypotheses.
Host: Gary Shiu
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Department Meeting
Department Meeting - CANCELLED
Time: 12:15 pm
Place: Virtual see "abstract" for connection info
Speaker: Sridhara Dasu, Department Chair, UW-Madison
Host: Sridhara Dasu, Department Chair
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Thesis Defense
Observations of helical plasma dynamics using complementary x-ray diagnostics in the MST
Time: 1:00 pm
Speaker: Patrick VanMeter, Physics PhD Graduate Student
Abstract: Meeting ID: 954 7877 6831 Passcode: 295089
Host: Daniel Den Hartog, Co-Advisor
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Thursday, September 24th, 2020

Cosmology Journal Club
Time: 12:00 pm
Abstract: Cosmology Journal Club is back! We will be having virtual meetings this semester.

Each week, we start with a couple scheduled 15 minute talks about one's research, or an arXiv paper. The last 30 minutes will typically be open to the group for anyone to discuss an arXiv paper.

All are welcome and all fields of cosmology are appropriate.

Contact Ross Cawthon, cawthon@wisc, for more information.

Zoom info
Meeting ID: 93592708053, passcode: cmbadger

Or click:
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Graduate Program Event
PhD Defense
Time: 3:30 pm
Place: Zoom,
Speaker: Usama Hussain, UW-Madison
Abstract: Measurements of ZZ Production Cross Sections using four-lepton events and constraints on anomalous triple gauge couplings at √s =13 TeV using the CMS detector at the CERN LHC
Host: Sridhara Dasu
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Astronomy Colloquium
"Knitting Together a New 3D View of our "Milky Way Galaxy"."
Time: 3:45 pm
Place: Zoom meeting(see Abstract ) Coffee and tea 3:30 pm, Talk 3:45 PM
Speaker: Catherine Zucker, Harvard CfA
Abstract: Until recently, much of our understanding of the 3D structure of our Milky Way was based on 2D observations of stars and dust, or spectral-line observations of gas. Distance measurements needed to turn the 2D sky into a 3D physical picture of the stars and interstellar clouds that form them were few and far between. In this talk, I will discuss how the rise of Gaia and large photometric surveys — in combination with new data science and visualization techniques — are quickly changing the landscape. In particular, I will show how 3D dust maps have received a huge distance resolution boost from Gaia, and how 3D dust can be “knitted” together with velocity information from gas and young stars to render new 3D spatial-kinematic views of our solar neighborhood, on scales of individual clouds to swaths of spiral arms. On small scales, I will present a new analysis of the 3D spatial topologies of local molecular clouds. And on large scales, I will show how many of these clouds are connected into a 2.7-kpc-long undulating structure called the Radcliffe Wave, which redefines our understanding of the Local Arm nearby.
Zoom Link:

Meeting ID: 885 1389 6776

Passcode: 713070
Host: Robert Benjamin, UW Astronomy Department
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Friday, September 25th, 2020

Graduate Introductory Seminar (Physics 701)
Frontiers in Linear and Nonlinear Plasma Physics
Time: 12:05 pm
Place: BBCollaborate
Speaker: Jeff Parker, UW Madison Department of Physics
Host: Sridhara Dasu
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Theory Seminar (High Energy/Cosmology)
Probing Particle Physics with Gravitational Waves
Time: 2:00 pm
Place: For zoom link, sign up at:
Speaker: Horng Sheng Chia, Institute for Advanced Study
Abstract: Gravitational wave astronomy will transform astrophysics in many ways; can it do the same for particle physics? In this talk, I will describe how the gravitational waves emitted by binary systems offer us a new window onto physics beyond the Standard Model. I will focus on a specific class of new physics called ultralight bosons, which can spontaneously form boson clouds around rotating black holes. Remarkably, the dynamics of these clouds in binary systems can be formulated as “scattering events” that are quantified by a “S-matrix”. Furthermore, the signatures emitted by these binary systems allow us to infer the masses and intrinsic spins of these ultralight bosons, making binary black holes novel detectors for these putative new fields. I will end with a brief discussion on probes of other types of new physics, including current efforts to search for these novel signatures in the data.
Host: Lars Aalsma
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Department Coffee Hour
Time: 3:30 pm
Abstract: Join us weekly for an informal virtual coffee hour! Catch up with others in the department, tell us how things are going, and impress everyone with your Zoom background skills. Coffee Hour is open to any and all faculty, staff, and students in the department. Sometimes we have a topic, and we'll try to get that topic posted here in advance or sent out by email before each coffee hour.
Host: Department
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