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Events at Physics

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Events During the Week of November 29th through December 5th, 2020

Sunday, November 29th, 2020

Academic Calendar
Thanksgiving recess
Time: 12:00 am
Place:
Abstract: *Note: actual end time may vary.*
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Monday, November 30th, 2020

Academic Calendar
All classes move to virtual format for the remainder of the semester
Time: 12:00 am
Place:
Abstract: *Note: actual end time may vary.*
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Plasma Physics (Physics/ECE/NE 922) Seminar
Predicting Stability and Performance of Tokamak Plasmas Using Flexible, Integrated Modeling
Time: 12:00 pm
Place: online
Speaker: Brendan Lyons, General Atomics
Abstract: This is the annual Dalton Schnack Memorial Lecture.

Tokamak fusion reactors will require predictive, integrated models to optimize performance while maintaining robustness against disruptions. The STEP (Stability, Transport, Equilibrium, & Pedestal) module, developed in OMFIT, predicts stable equilibria self-consistently with core-transport and pedestal calculations by coupling together the following codes: ONETWO, TGYRO, EFIT, CHEASE, EPED, DCON, GATO, and CHEF (a current-drive, heating, & fueling module). Each code reads and writes data from a centralized IMAS data structure, allowing codes to be run in arbitrary order and enabling open-loop, feedback, and optimization workflows. Core-pedestal calculations with STEP have been validated against the equilibria and profiles of individual DIII-D discharges and the confinement times of the H98,y2 database. In addition, such workflows have been used to assess performance in ITER and the suppression of turbulence in DIII-D negative-triangularity plasmas. Recent enhancements to STEP have permitted accurate simulations of more exotic scenarios, in particular a negative-central-shear DIII-D scenario. In the near future, STEP calculations of stability in existing and planned tokamak scenarios will allow for the optimization of heating and current drive to maximize plasma pressure while maintaining MHD stability.
Host: Paul Terry
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Tuesday, December 1st, 2020

Academic Calendar
All classes move to virtual format for the remainder of the semester
Time: 12:00 am
Place:
Abstract: *Note: actual end time may vary.*
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Academic Calendar
Online - Program Overview: Masters in Learning Analytics Program
Time: 12:00 pm
Place:
Abstract: Interested in using data to make an impact on teaching, learning and policy in the world of education? Join program director Julia Rutledge and enrollment coach Pat Walsh to get more information about the Learning Analytics master's program including curriculum, application process and potential career paths. URL: https://www.tfaforms.com/4852018 ONLINE EVENT: https://www.tfaforms.com/4852018
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Wednesday, December 2nd, 2020

Academic Calendar
All classes in virtual format for the remainder of the semester
Time: 12:00 am
Place:
Abstract: *Note: actual end time may vary.*
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Physics ∩ ML Seminar
Harnessing Data Revolution in Quantum Matter
Time: 11:00 am
Place: Online Seminar: Please sign up for our mailing list at www.physicsmeetsml.org for zoom link
Speaker: Eun-Ah Kim, Cornell University
Abstract: Our desire to better understand quantum emergence drove efforts in improving computing power and experimental instrumentation dramatically. However, the resulting increase in volume and complexity of data present new challenges. I will discuss how these challenges can be embraced and turned into opportunities by employing principled machine learning approaches. The rigorous framework for scientific understanding we enjoy in physics makes interpretability an essential feature for machine learning to lead to scientific progress. I will discuss our recent results using machine learning approaches designed to be interpretable from the outset. Specifically, I will present discovering order parameters and their fluctuations in voluminous X-ray diffraction data and discovering signature correlations in quantum gas microscopy data as concrete examples.
Host: Gary Shiu
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Department Meeting
Department Meeting - CLOSED MEETING FOR TENURED FACULTY ONLY
Time: 12:15 pm
Place: CLOSED MEETING FOR TENURED FACULTY ONLY
Speaker: Sridhara Dasu, Department Chair, UW-Madison
Meeting Coordinates: Meeting number: 120 392 9242 Password: Q5EjaTz3Pk3 (75352893 from phones) https://uwmadison.webex.com/uwmadison/j.php?MTID=m4be4e8a6254fdcd033b6c946ffeee6c8 Join by video system Dial 1203929242@uwmadison.webex.com You can also dial 173.243.2.68 and enter your meeting number. Join by phone +1-415-655-0001 US Toll +1-312-535-8110 United States Toll (Chicago) Access code: 120 392 9242
Host: Sridhara Dasu, Department Chair
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Thursday, December 3rd, 2020

Academic Calendar
All classes move to virtual format for the remainder of the semester
Time: 12:00 am
Place:
Abstract: *Note: actual end time may vary.*
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Astronomy Colloquium
"A Predictive Theory of Star Formation and Turbulence Driving Across Cosmic Time"
Time: 11:00 am
Place: Zoom meeting (see Abstract ) meet the students at 10am, coffee and tea at 10:45am
Speaker: Blakesley Burkhart, Rutgers/Flatiron Institute
Abstract: The interstellar medium (ISM) is a multiphase environment where magnetohydrodynamic (MHD) turbulence affects many key processes that govern the evolution of galactic disks include star formation.
In this talk, I shall present an overview of new analytic models connecting turbulence, star formation, feedback, and disk instability. I will show that the turbulence in discs can be powered primarily by star formation feedback, radial transport, or a combination of the two. From scales of giant molecular clouds (GMCs), I will demonstrate how the star formation efficiency can be analytically calculated from our understanding of how turbulence, gravity, and stellar feedback induce density fluctuations in the ISM via a probability distribution function analysis. This analytic calculation predicts star formation rates and star formation efficiency from pc size scales (GMCs) to kpc size scales in galaxies and provides predictions for upcoming high-z JWST observations.

Zoom Link information

URL: https://us02web.zoom.us/j/88513896776?pwd=Y1JtRE1KZllxWkFTamJBSGtGdm9yQT09

Meeting ID: 885 1389 6776
Passcode: 713070
Host: Professor Alex Lazarian
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Search for pp → ttc, ttt and btb at the LHC as Probe of Top-changing Extra Higgs Bosons
Time: 11:00 am
Place: Zoom: https://uwmadison.zoom.us/j/91932930074?pwd=ZWJHaU02K2pHZCswZXJHdWx1Y2Vzdz09
Speaker: George W.S. Hou , National Taiwan University
Abstract: With the absence of New Physics at the LHC or elsewhere, we argue that a general two Higgs doublet model (g2HDM) with extra Yukawa couplings as the compelling ― and accessible ― New Physics. The exotic H, A and H+ bosons should be sub-TeV in mass, but well-hidden from our view so far by
1) fermion mass-mixing hierarchy,
2) alignment (small h(125)-H mixing), and
3) (the mysterious) near-diagonal d-type extra Yukawa coupling matrix.
We give a general perspective on search strategies at the LHC, focusing on extra top Yukawa couplings, both top changing and conserving, of the exotic Higgs boson. These couplings connect with electroweak baryogenesis and the electron electric dipole moment, and there is a plethora of other flavor observables. At the LHC, we advocate the cg → ttc, ttt and btb production processes, and urge experimental search.
Host: Kevin Black
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Cosmology Journal Club
Time: 12:00 pm
Place:
Abstract: Cosmology Journal Club is virtual this semester.

Each week, we start with a couple scheduled 15-20 minute talks about one's research, or an arXiv paper. The last ~20 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.
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Friday, December 4th, 2020

Academic Calendar
All classes move to virtual format for the remainder of the semester
Time: 12:00 am
Place:
Abstract: *Note: actual end time may vary.*
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Graduate Introductory Seminar (Physics 701)
1) Anomalous Quantum Transport: Interactions, Disorder, Topology 2) Quantum Computing with Superconducting Circuits
Time: 12:05 pm
Place: BBCollaborate
Speaker: 1) Alex Levchenko 2) Robert McDermott, UW Madison Department of Physics
Host: Sridhara Dasu
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Theory Seminar (High Energy/Cosmology)
Replica wormholes, the black hole information paradox, and cosmology
Time: 2:00 pm
Place: For zoom link, sign up at: https://groups.google.com/a/g-groups.wisc.edu/d/forum/theoryseminars/join
Speaker: Edgar Shaghoulian, University of Pennsylvania
Abstract: I will introduce the black hole information paradox and briefly review the role that replica wormholes play in obtaining black hole evolution consistent with unitarity. I will then discuss general consistency conditions that guide the search for such nontrivial saddles in the gravitational path integral, with several examples in cosmological spacetimes.
Host: Lars Aalsma
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Department Coffee Hour
Time: 3:30 pm
Place: https://cern.zoom.us/j/98625439661?pwd=NmNMeit4aGNLOSs3eHl0RHk0ZHRKUT09
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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Saturday, December 5th, 2020

Academic Calendar
All classes move to virtual format for the remainder of the semester
Time: 12:00 am
Place:
Abstract: *Note: actual end time may vary.*
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