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Events During the Week of July 25th through August 1st, 2021

Monday, July 26th, 2021

Thesis Defense
Multi-messenger Astrophysics
Time: 11:00 am
Place: 2241 Chamberlin and zoom link in description
Speaker: Raamis Hussain, Physics PhD Graduate Student
Abstract: The discovery of high-energy astrophysical neutrinos by IceCube in 2013 and of gravitational waves by LIGO in 2015 have enabled a new era of multi-messenger astronomy. Gravitational waves can identify the merging of compact objects such as neutron stars and black holes. These compact mergers, especially neutron star mergers, are potential neutrino sources. I will detail my work searching for a correlation between compact binary mergers and high-energy neutrino emission using IceCube neutrino data together with gravitational wave data provided by the LIGO Virgo Collaboration. Zoom Link:
Host: Justin Vandenbroucke, Faculty Advisor
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Tuesday, July 27th, 2021

Network in Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS) Seminar
Dark Neutrons: Cosmology and New Astrophysical Signatures
Time: 2:00 pm
Speaker: Nirmal Raj, TRIUMF, Canada
Abstract: New states that mix with the neutron, such as dark baryons and mirror neutrons, have been proposed to address dark matter, baryogenesis, the long-standing neutron lifetime anomaly, and the recent XENON1T excess. I show that such states are extensively probed by (1) Big Bang nucleosynthesis, (2) cosmic microwave background spectra, (3) stability of nuclides in low-metallicity stars, (4) a novel mechanism to heat neutron stars by tapping the energy stored in their Fermi seas. This latter effect already constrains a vast range of parameter space, and provides a powerful motivation for imminent optical, ultraviolet and infrared astronomical missions, namely, of directly probing the properties of the neutron. Talk based on 2012.09865 & 2105.09951.
Host: Baha Balantekin
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Wednesday, July 28th, 2021

Physics ∩ ML Seminar
Compositionality of Symmetry in Equivariant Multilayer Perceptrons
Time: 11:00 am - 12:15 pm
Place: Online Seminar: Please sign up for our mailing list at for zoom link
Speaker: Siamak Ravanbaksh, McGill University
Abstract: A principled approach to modeling structured data is to consider all transformations that maintain structural relations. Using this perspective in deep learning leads to the design of models that are invariant or equivariant to the symmetry transformations of the data. Symmetry groups can be composed in different ways, and in this talk, I explore the utility of the compositionality of symmetry groups in deep learning. In particular, I review different notions of group composition and their application in deep model design for new and compositional data structures.
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Thursday, July 29th, 2021

Cosmology Journal Club
Time: 12:00 pm - 1:00 pm
Abstract: Each week, we start with a couple scheduled talks about one's research, or an arXiv paper. Then we open up 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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Friday, July 30th, 2021

Academic Calendar
Graduate School Summer 2021: Requests for all Master&#39;s and Doctoral Degree Warrants
Time: 11:55 pm - 12:55 am
Abstract: CONTACT: 262-2433,
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