Events at Physics |
Events on Thursday, December 5th, 2024
- R. G. Herb Condensed Matter Seminar
- Special Seminar by Graduate Students
- Time: 10:00 am
- Place: 5310 Chamberlin Hall
- Speaker: Abigail Shearrow (UW-Madison) and Steffen Bollmann (MPISSR-Stuttgart )
- Abstract: First Talk (30min)
Abigail Shearrow:
"Noise and efficiency of a Josephson mm-wave detector"
Second Talk (30min)
Steffen Bollmann
"Topological Green's function zeros in an exactly solved model and beyond"
- Host: Alex Levchenko
- Preliminary Exam
- Investigating Potential Time Dependence in the Cosmic Ray Anisotropy
- Time: 2:30 pm - 4:30 pm
- Place: B343 Sterling Hall
- Speaker: Perri Zilberman, Physics PhD Graduate Student
- Abstract: The cosmic ray flux has been found to be nearly isotropic on the sky, however a significant and robust anisotropy has been found by IceCube as well as a number of other experiments. This anisotropy is likely in part caused by cosmic rays interacting with the magnetic field of the heliosphere. The heliosphere is dynamic, largely due to changes in solar activity. This suggests that the Cosmic Ray Anisotropy should similarly vary in time, in step with the heliosphere, though there is not a consistent picture of how such a time variation would present itself observationally. Considering this, we present a model-independent method to test for time variation in the Cosmic Ray Anisotropy. This method is then validated using a sample of data from the IceCube Neutrino Observatory.
- Host: Albrecht Karle
- Astronomy Colloquium
- New Insights Into Novae
- Time: 3:30 pm - 4:30 pm
- Place: 4421 Sterling Hall
- Speaker: Elias Aydi, Texas Tech University
- Abstract: Novae are panchromatic transients triggered by a thermonuclear runaway on the surfaces of white dwarf stars in interacting binaries. Our understanding of how novae are powered has been altered with the Fermi gamma-ray telescope establishing novae as bright GeV gamma-ray sources and thus a new class of particle accelerators in our Galaxy. This unexpected discovery underscores the complexity of novae and their value as laboratories for studying shocks and particle acceleration. In this talk I will highlight our ongoing multi-wavelength/multi-messenger efforts aimed at understanding how shocks work in novae. These efforts can help us probe critical but poorly understood physical processes, such as common envelope interaction, super-Eddington luminosities, particle acceleration efficiency, and dust formation around explosive transients, and are essential for a better understanding of other shock-powered transients in the Universe such as supernovae, stellar mergers, and tidal disruption events.
- Host: Melinda Soares-Furtado
- Astronomy Colloquium
- New Insights Into Novae
- Time: 3:30 pm - 4:30 pm
- Place: 4421 Sterling Hall
- Speaker: Elias Aydi, Texas Tech University
- Abstract: Novae are panchromatic transients triggered by a thermonuclear runaway on the surfaces of white dwarf stars in interacting binaries. Our understanding of how novae are powered has been altered with the Fermi gamma-ray telescope establishing novae as bright GeV gamma-ray sources and thus a new class of particle accelerators in our Galaxy. This unexpected discovery underscores the complexity of novae and their value as laboratories for studying shocks and particle acceleration. In this talk I will highlight our ongoing multi-wavelength/multi-messenger efforts aimed at understanding how shocks work in novae. These efforts can help us probe critical but poorly understood physical processes, such as common envelope interaction, super-Eddington luminosities, particle acceleration efficiency, and dust formation around explosive transients, and are essential for a better understanding of other shock-powered transients in the Universe such as supernovae, stellar mergers, and tidal disruption events.
- Host: Melinda Soares-Furtado