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Events During the Week of March 7th through March 14th, 2021

Monday, March 8th, 2021

Plasma Theory Seminar
Modeling RFPs with self-consistent steady states of a cylindrical pinch
Time: 9:00 am
Place: zoom meeting
Speaker: Urvashi Gupta, UW-Madison
Abstract: Chris Hegna is inviting you to a scheduled Zoom meeting.

Join Zoom Meeting
https://uwmadison.zoom.us/j/9548787359?pwd=VndwdGVMd2doQzVBWlgrZFc1Ni9pUT09

Meeting ID: 954 878 7359
Passcode: 4Ugg1v

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Meeting ID: 954 878 7359
Passcode: 596249
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Plasma Physics (Physics/ECE/NE 922) Seminar
Progress on high-field HTS magnets for SPARC, a compact net-energy fusion tokamak
Time: 12:00 pm
Place: Zoom
Speaker: Prof. Zach Hartwig, MIT
Abstract: Chris Hegna is inviting you to a scheduled Zoom meeting.

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https://uwmadison.zoom.us/j/91835419103?pwd=YXhDdGlFeEZtc0c0MlZySUp0Q1FrUT09

Meeting ID: 918 3541 9103
Passcode: 578475
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Meeting ID: 918 3541 9103
Passcode: 578475
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Meeting ID: 918 3541 9103
Passcode: 578475
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Graduate Program Event
Electron-electron interactions in Si/SiGe Quantum Dots
Time: 2:00 pm
Place: https://uwmadison.zoom.us/j/94566927415?pwd=MUtXazdPZEhDSVduZHVmemZIRktKdz09
Speaker: Ekmel Ercan, Physics PhD Graduate Student
Abstract: In this talk I present our work on the effects of confinement strength on two-electron states in an electrostatically-defined quantum dot in a Si/SiGe quantum well at zero magnetic field, focusing on geometries appropriate for qubits. I will discuss that the experimental signatures of strong electron-electron (e-e) interactions in these devices can be subtle. While the suppression of the singlet-triplet splitting in two-electron quantum dots formed in direct band gap materials is a clear indication of e-e interactions, in silicon devices this effect can be masked by the additional valley degree of freedom of the conduction band electrons, when the quantum well interface is flat. I will further argue that interfacial-disorder-induced valley-orbit coupling, on the other hand, can induce this suppression. Next, I will discuss implications of this physics on charge noise sensitivity and demonstrate calculations indicating that dramatic changes in dephasing times can be observed by slightly changing the confinement strength. Finally, I will discuss the role of e-e interactions in two recent experiments demonstrating (1) the use of valley-orbit states to probe Si/SiGe interface, and (2) a spectroscopically-dense set of low-lying energy levels.
Host: Sue Coppersmith, Faculty Advisor
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Tuesday, March 9th, 2021

Council Meeting
Physics Council
Time: 4:00 pm
Place: https://uwmadison.zoom.us/j/98476092525?pwd=Q3hBWmVZYkxOWUdBMmFpa2dKSFRIQT09
Host: Sridhara Dasu
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Wednesday, March 10th, 2021

Physics ∩ ML Seminar
Generative and Invertible Networks for the LHC
Time: 11:00 am
Place: Online Seminar: Please sign up for our mailing list at www.physicsmeetsml.org for zoom link
Speaker: Tilman Plehn, Heidelberg University
Abstract: LHC physics is a unique field in the sense that we compare vast and highly complex data sets with precise first-principles predictions. These predictions usually rely on Monte Carlo simulations. I will show how generative neural networks can supplement these simulations and discuss conceptional advantages of this method. I will then explain how generative networks can invert event simulations. Flow-based invertible networks allow us to invert or unfold individual detector simulations of QCD parton showers in a mathemacially consistent manner. That means that they predict calibrated probability distributions in parton-level phase space for individual observed events. Finally, I will illustrate how the same networks can infer the structure of QCD splittings forming jets.
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Department Meeting
Time: 12:15 pm
Place: Virtual see "abstract" for connection info
Speaker: Sridhara Dasu, Department Chair
AIMEE N LEFKOW is inviting you to a scheduled Zoom meeting.

Topic: Department Meeting
Time: Jan 13, 2021 12:15 PM Central Time (US and Canada)
Every week on Wed, until May 12, 2021, 18 occurrence(s)
Jan 13, 2021 12:15 PM
Jan 20, 2021 12:15 PM
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Meeting ID: 924 9932 5588
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Meeting ID: 924 9932 5588
Passcode: 337209

Host: Sridhara Dasu
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Thursday, March 11th, 2021

Cosmology Journal Club
Time: 12:00 pm
Place:
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:
https://uwmadison.zoom.us/j/93592708053?pwd=VWVNMDJXV2N1blV0emg4ZUg3ZGRiUT09
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Student Social Hour with Physics Colloquium Speaker
Student Social Hour with Physics Colloquium Speaker Dr. Brian Nord
Time: 2:00 pm
Place: https://uwmadison.zoom.us/j/97126863667?pwd=Qk5vT0ttWm43Q01HSk5OdUZOQ1Z4UT09
Speaker: Dr. Brian Nord, Fermilab
Abstract: This is an opportunity for undergraduate and graduate students to meet informally with Physics Colloquium speaker Dr. Brian Nord (Fermilab).

Note that the Physics Colloquium given by Dr. Nord is 5 March 2021, and all students are welcome and encouraged to attend.
https://www.physics.wisc.edu/events/?id=6294
Host: Keith Bechtol
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Astronomy Colloquium
" A Collage of Exoplanets on the Mass-Period Diagram"
Time: 3:30 pm
Place: Zoom meeting (see Abstract ) Coffee and tea 3:30 pm, Talk 3:45 PM
Speaker: Ji Wang, Ohio State
Abstract: I will talk about different populations of exoplanets and their interconnection. Specifically, I will present chemical composition measurements for hot Jupiters and directly-imaged young jovian planets, in an attempt to answer questions such as how stellar chemical composition controls the planet formation; how the difference of planetary and stellar chemical abundance reveals the history of orbital migration. In addition, I will highlight the recent progress in comparative planetology by contrasting (1) small planets with different densities and structures; and (2) Earth-size rocky planets vs. gas dwarf planets in the habitable zone. These comparative studies shed light on the origin of the diverse outcome of planet formation and the search for biosignatures with current and future facilities.

Web Link:
https://uwmadison.zoom.us/j/88513896776?pwd=Y1JtRE1KZllxWkFTamJBSGtGdm9yQT09
Host: Ke Zhang
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Friday, March 12th, 2021

Theory Seminar (High Energy/Cosmology)
New Physics and the Black Hole Mass Gap
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: Djuna Croon, TRIUMF
Abstract: In this talk I will demonstrate the potential of the black hole mass gap to probe new physics. The mass gap, in which no black holes can be formed, is a standard prediction of stellar structure theory. I will show that physics beyond the Standard Model may dramatically alter the late stages of stellar evolution, when it acts as an additional source of energy (loss) or modifies its equation of state. This results in variations in black hole populations, most prominently observable through shifts of the mass gap. The gravitational wave observations by the LIGO/Virgo collaboration will bring the edges of the black hole mass gap in sight in the coming years, making this an interesting novel probe of new physics.
Host: Lars Aalsma
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Department Coffee Hour
Department Coffee Hour (Virtual)
Time: 3:30 pm
Place: Virtual (see abstract for connection info)
Abstract: Topic: Department Coffee Hour
Time: Jan 29, 2021 03:30 PM Central Time (US and Canada)
Every week on Fri, until May 14, 2021, 16 occurrence(s)
Jan 29, 2021 03:30 PM
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Weekly: https://uwmadison.zoom.us/meeting/tJMkf-yqpjojHdRt7HGeqviWNpBBgTH6ardi/ics?icsToken=98tyKuCvpzMvGNyUuR6HRowEHYqgZ-rxiH5EgqdviEjNJCVCdArBGPJgELVLOI7R

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https://uwmadison.zoom.us/j/97985281970?pwd=alp0enRHWmR2SnlxM2g3cCttdTU4Zz09

Meeting ID: 979 8528 1970
Passcode: 309601
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Meeting ID: 979 8528 1970
Passcode: 309601
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213.244.140.110 (Germany)
103.122.166.55 (Australia)
149.137.40.110 (Singapore)
64.211.144.160 (Brazil)
69.174.57.160 (Canada)
207.226.132.110 (Japan)
Meeting ID: 979 8528 1970
Passcode: 309601


Host: Climate and Diversity Committee
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