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Events During the Week of March 21st through March 28th, 2021

Monday, March 22nd, 2021

Plasma Physics (Physics/ECE/NE 922) Seminar
Fusion plasma physics issues for tokamak DEMOnstration reactors
Time: 12:00 pm
Place: Zoom Meeting
Speaker: Prof. Hartmut Zohm, Max Planck Institute for Plasma Physics
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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Plasma Theory Seminar
NO SEMINAR
Time: 4:00 pm
Place:
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Tuesday, March 23rd, 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 24th, 2021

Physics ∩ ML Seminar
Algebraic Neural Networks
Time: 11:00 am
Place: Online Seminar: Please sign up for our mailing list at www.physicsmeetsml.org for zoom link
Speaker: Alejandro Ribeiro, University of Pennsylvania
Abstract: We study algebraic neural networks (AlgNNs) with commutative algebras which unify diverse architectures such as Euclidean convolutional neural networks, graph neural networks, and group neural networks under the umbrella of algebraic signal processing. An AlgNN is a stacked layered structure where each layer is conformed by an algebra, a vector space and a homomorphism between the algebra and the space of endomorphisms of the vector space. Signals are modeled as elements of the vector space and are processed by convolutional filters that are defined as the images of the elements of the algebra under the action of the homomorphism. We analyze stability of algebraic filters and AlgNNs to deformations of the homomorphism and derive conditions on filters that lead to Lipschitz stable operators. We conclude that stable algebraic filters have frequency responses – defined as eigenvalue domain representations – whose derivative is inversely proportional to the frequency – defined as eigenvalue magnitudes. It follows that for a given level of discriminability, AlgNNs are more stable than algebraic filters, thereby explaining their better empirical performance. This same phenomenon has been proven for Euclidean convolutional neural networks and graph neural networks. Our analysis shows that this is a deep algebraic property shared by a number of architectures. Further details in arxiv.org/abs/2009.01433 and gnn.seas.upenn.edu/lecture-12.
Host: Gary Shiu
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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
Jan 27, 2021 12:15 PM
Feb 3, 2021 12:15 PM
Feb 10, 2021 12:15 PM
Feb 17, 2021 12:15 PM
Feb 24, 2021 12:15 PM
Mar 3, 2021 12:15 PM
Mar 10, 2021 12:15 PM
Mar 17, 2021 12:15 PM
Mar 24, 2021 12:15 PM
Mar 31, 2021 12:15 PM
Apr 7, 2021 12:15 PM
Apr 14, 2021 12:15 PM
Apr 21, 2021 12:15 PM
Apr 28, 2021 12:15 PM
May 5, 2021 12:15 PM
May 12, 2021 12:15 PM
Please download and import the following iCalendar (.ics) files to your calendar system.
Weekly: https://uwmadison.zoom.us/meeting/tJYpfuCrrD4vEtyo-iHQ60Kr6o_QGlZ3oBT4/ics?icsToken=98tyKuCqqjIjGdaQtRGPRowQBor4XenzpiVYj7dEk1LsKxEFMijkYO19A5VzKovf

Join Zoom Meeting
https://uwmadison.zoom.us/j/92499325588?pwd=T3lwZjEveWJqNGgrU3ljRmdTS0hOdz09

Meeting ID: 924 9932 5588
Passcode: 337209
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+1 312 626 6799 US (Chicago)
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+1 346 248 7799 US (Houston)
Meeting ID: 924 9932 5588
Passcode: 337209
Find your local number: https://uwmadison.zoom.us/u/abhpt7GE9P

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162.255.37.11 (US West)
162.255.36.11 (US East)
115.114.131.7 (India Mumbai)
115.114.115.7 (India Hyderabad)
213.19.144.110 (Amsterdam Netherlands)
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: 924 9932 5588
Passcode: 337209

Host: Sridhara Dasu
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Thursday, March 25th, 2021

Cosmology Journal Club
Time: 12:00 pm
Place:
Abstract: Each week, we start with a couple scheduled 15-20 minute talks about one's research, or an arXiv paper. The last part 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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Astronomy Colloquium
Galaxy Evolution from Large Surveys of Nearby Resolved Galaxies
Time: 3:30 pm
Place: Zoom meeting(see Abstract ) Coffee and tea 3:30 pm, Talk 3:45 pm
Speaker: Karen Masters, Haverford College
Abstract: The morphology of a galaxy provides information on the orbits of stars within it. As such, important clues to the formation history of galaxies are revealed by their morphologies, and this information is complimentary, but not identical to, their star formation history and chemical composition as revealed by photometry and spectra.The Galaxy Zoo project (www.galaxyzoo.org) has provided quantitative visual morphologies for over a million galaxies (including the entire Sloan Digital Sky Surveys, or SDSS Main Galaxy Sample), and has been part of a reinvigoration of interest in the morphologies of galaxies and what they reveal about the evolution of galaxies. Mapping Nearby Galaxies at Apache Point Observatory (MaNGA, part of SDSS-IV), has now completed its goal to obtain spatially resolved spectral maps for 10,010 nearby galaxies (all of which have Galaxy Zoo morphologies). This is by far the largest sample of resolved spectroscopy in the world. In this talk I will review these projects, and show results from them which demonstrate why a resolved view of the internal morphology in large samples of galaxies is interesting and how it provides a unique constraint of our understanding of galaxy evolution. https://uwmadison.zoom.us/j/88513896776?pwd=Y1JtRE1KZllxWkFTamJBSGtGdm9yQT09
Host: Professor Eric Wilcots
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Friday, March 26th, 2021

Theory Seminar (High Energy/Cosmology)
Gamma-ray flashes from dark photons in neutron star mergers
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: Gustavo Marques Tavares, University of Maryland
Abstract: In this talk, I will show how dark photons can lead to a very bright flash of gamma-rays immediately after a binary neutron star merger. This presents a new promising avenue to explore dark sectors through multi-messenger astronomy in the gravitational wave era.
Host: Lars Aalsma
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Graduate Program Event
Faculty/Grad Student Summer RA Meet & Greet (Virtual)
Time: 3:30 pm
Place: Register here: https://uwmadison.zoom.us/meeting/register/tJIsc-2vpzMtEtKJEp2e_JPNZqmOKPcSNSed
Speaker: Faculty/Grad Students, Looking for Summer 2021 RA's
Abstract: Join us on Friday, March 26th at 3:30pm (in place of the usual weekly coffee hour) if you are interested in taking a new student as an RA or if you are a graduate student looking for an RA this summer. We know that since we have been virtual for an entire year now, and also the fact that we have a few new faculty on board, many of you may not have met each other in the same way you would have in the good old days when we were all together in Chamberlin Hall. The virtual meet and greet event will aim to help first or second/third year students who have not yet secured an RA for Summer 2021 with the process of meeting faculty who are looking for RA’s this summer.

For the virtual event, we will start out in the zoom room together by going over a few logistical details about the summer RA process followed by breakout rooms for each faculty member or research area. Faculty members who wish to be in one breakout room together, please email me individually and we can be sure those logistics are sorted out in advance. Everyone who plans to attend should register in advance to get access to the zoom link and meeting information.
Host: Michelle Holland, Graduate Program Coordinator
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