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Events During the Week of April 18th through April 25th, 2021

Monday, April 19th, 2021

Plasma Physics (Physics/ECE/NE 922) Seminar
Powering the Future: Fusion & Plasmas, the FESAC Long Range Planning Report
Time: 12:00 pm
Place: Zoom Meeting
Speaker: Prof. Troy Carter, UCLA
Abstract: A long-range plan has been created to accelerate the development of fusion energy and advance plasma science. This plan is based on substantial input from the research community, which conveyed a wealth of creative ideas and its passion to accelerate fusion energy development and advance plasma science over an intensive two-year process. The FESAC Long Range Planning Report provides a decade-long vision for the field of fusion energy and plasma science, presenting a path to a promising future of new scientific discoveries, industrial applications, and ultimately the timely delivery of fusion energy.



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Chris Hegna is inviting you to a scheduled Zoom meeting.



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Meeting ID: 918 3541 9103

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Monday Science Seminar
The Chemical Quandaries of Titan’s Atmosphere (and How We Can Solve Them)
Time: 12:00 pm
Place:
Speaker: Erin Flowers, Princeton University
Abstract: Titan, Saturn’s largest moon, has one of the most robust atmospheres of any terrestrial body in the solar system. Its very existence came as a surprise Gerard Kuiper when he first detected it in 1944. Since then various studies, most famously the Cassini-Huygens mission, have worked to characterize this atmosphere - its formation, physical properties, and chemical composition. These studies have revealed several anomalies that have yet to be solved, such as the detached haze layers, a mysterious over abundance of molecular hydrogen, and an even more confounding downward flow of molecular hydrogen towards its surface. I’ll be discussing some of the channels I’m pursuing to try to explain these anomalies, and what it can indicate if none of them are correct.
Host: Melinda Soares-Furtado
Presentation: Monday_Science_Seminar.pdf
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Plasma Theory Seminar
Development and testing of a reduced runaway electron model for disruption simulation
Time: 4:00 pm
Place: Zoom Meeting
Speaker: Alex Sainterme, UW
Abstract: Chris Hegna is inviting you to a scheduled Zoom meeting.



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Meeting ID: 954 878 7359

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Tuesday, April 20th, 2021

Council Meeting
Physics Council
Time: 4:00 pm - 5:00 pm
Place:
Host: Sridhara Dasu
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Wednesday, April 21st, 2021

Physics ∩ ML Seminar
Machine Learning for Calabi-Yau metrics
Time: 11:00 am - 12:15 pm
Place: Online Seminar: Please sign up for our mailing list at www.physicsmeetsml.org for zoom link
Speaker: Fabian Ruehle, CERN and Oxford
Abstract: String theory is a very promising candidate for a fundamental theory of our universe. An interesting prediction of string theory is that spacetime is ten-dimensional. Since we only observe four spacetime dimensions, the extra six dimensions are small and compact, thus evading detection. These extra six-dimensional spaces, known as Calabi-Yau spaces, are very special and elusive. They come with a specific type of metric needed to make string theory consistent. While we know, thanks to the heroic work of Calabi and Yau, that this metric exists, we neither know what it looks like nor how to construct it explicitly. Thinking of the metric as a function that satisfies three constraints entering the Calabi-Yau theorem, we can parameterize the metric as a neural network and formulate the problem as multiple continuous optimization tasks. I will show that this allows us to approximate Calabi-Yau metrics to very high accuracy, which will have important applications in Physics and Mathematics.
Host: Gary Shiu
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Department Meeting
Department Meeting - CANCELLED
Time: 12:15 pm - 1:15 pm
Place: Cancelled due to lack of urgent business
Speaker: Sridhara Dasu, Department Chair
CANCELLED due to lack of urgent business.
Host: Sridhara Dasu
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Thursday, April 22nd, 2021

Cosmology Journal Club
Time: 12:00 pm - 1:00 pm
Abstract: 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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High Energy Seminar
Searches for New Physics with Long Lived Particles
Time: 2:00 pm - 3:30 pm
Place:
Speaker: Lesya Horyn, Fermi Lab
Abstract: With the lack of evidence for new physics from the LHC’s Run 2 dataset so far, it is essential that we leave no corner of phase space unexplored. In this talk, I will discuss a recent result from the ATLAS Experiment looking for leptons with large impact parameters. This result provides unique sensitivity to sleptons with lifetimes between 0.001 and 10 ns in Gauge-Mediated Supersymmetry Models for the first time at the LHC, improving upon previous limits by almost an order of magnitude. I will also discuss trigger limitations in searches for long lived particles, and how the planned upgrades to the LHC detectors might be able to improve the situation.

ZOOM Only:
Host: Kevin Black
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Searches for New Physics with Long Lived Particles
Time: 2:00 pm - 3:00 pm
Place: Zoom:
Speaker: Lesya Horyn, Fermilab
Abstract: With the lack of evidence for new physics from the LHC’s Run 2 dataset so far, it is essential that we leave no corner of phase space unexplored. In this talk, I will discuss a recent result from the ATLAS Experiment looking for leptons with large impact parameters. This result provides unique sensitivity to sleptons with lifetimes between 0.001 and 10 ns in Gauge-Mediated Supersymmetry Models for the first time at the LHC, improving upon previous limits by almost an order of magnitude. I will also discuss trigger limitations in searches for long lived particles, and how the planned upgrades to the LHC detectors might be able to improve the situation.
Host: Kevin Black
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Astronomy Colloquium
Simulating Galaxy Formation
Time: 3:30 pm - 5:00 pm
Place: Zoom meeting(see Abstract ) Coffee and tea 3:30pm, Talk 3:45pm
Speaker: Mark Vogelsberger, MIT
Abstract: Cosmological simulations of galaxy formation have evolved significantly over the last years. In my talk I will describe recent efforts to model the large-scale distribution of galaxies with cosmological hydrodynamics simulations. I will focus on large-scale simulations like IllustrisTNG. After demonstrating the success of these simulations in terms of reproducing an enormous amount of observational data, I will also talk about their limitations and directions for further improvements over the next couple of years.

Zoom Link:
Host: Elena D'onghia
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Friday, April 23rd, 2021

Theory Seminar (High Energy/Cosmology)
The Weak Scale as a Trigger
Time: 11:00 am - 12:00 pm
Place: For zoom link, sign up at:
Speaker: Raffaele-Tito D'Agnolo, Université Paris-Saclay
Abstract: I will discuss settings where the Higgs mass squared affects the vacuum expectation value of local operators and can thus act as a “trigger” of new cosmological dynamics. This triggering mechanism underlies several existing solutions to the hierarchy problem that trace the origin of the weak scale to the early history of the Universe. Thinking about these solutions more systematically from the point of view of weak scale triggers allows to understand their common predictions, to find new solutions and to identify unexpected physics related to naturalness in a rather model-independent way. As an example I discuss a BSM trigger in a Two Higgs Doublet Model and show how it can be used to link the tuning of the Higgs mass to that of the cosmological constant. This weak scale trigger demands the existence of new Higgs states necessarily comparable to or lighter than the weak scale, with no wiggle room to decouple them.
Host: Lars Aalsma
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Department Coffee Hour
Department Coffee Hour (Virtual)
Time: 3:30 pm - 4:30 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)
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213.244.140.110 (Germany)
103.122.166.55 (Australia)
149.137.40.110 (Singapore)
64.211.144.160 (Brazil)
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207.226.132.110 (Japan)
Meeting ID: 979 8528 1970
Passcode: 309601


Host: Climate and Diversity Committee
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