Events at Physics
Events During the Week of July 25th through August 1st, 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: https://uwmadison.zoom.us/j/92930446802
- Host: Justin Vandenbroucke, Faculty Advisor
- Network in Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS) Seminar
- Dark Neutrons: Cosmology and New Astrophysical Signatures
- Time: 2:00 pm
- Place: https://berkeley.zoom.us/j/91922781599
- 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
- Physics ∩ ML Seminar
- Compositionality of Symmetry in Equivariant Multilayer Perceptrons
- Time: 11:00 am
- Place: Online Seminar: Please sign up for our mailing list at www.physicsmeetsml.org 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.
- Cosmology Journal Club
- Time: 12:00 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.
Meeting ID: 93592708053, passcode: cmbadger
- Academic Calendar
- Graduate School Summer 2021: Requests for all Master's and Doctoral Degree Warrants
- Time: 11:55 pm
- Abstract: http://www.grad.wisc.edu CONTACT: 262-2433, email@example.com