Events at Physics |
Events on Thursday, October 10th, 2024
- R. G. Herb Condensed Matter Seminar
- An Electron Linear Accelerator for On-Demand Qubit Irradiation
- Time: 10:00 am - 11:00 am
- Place: 5310 Chamberlin
- Speaker: Dwight Luhman, Sandia National Labs
- Host: Mark Eriksson
- NPAC (Nuclear/Particle/Astro/Cosmo) Forum
- A stress test of Galactic cosmic rays
- Time: 2:30 pm - 3:30 pm
- Place: Chamberlin 5280 /
- Speaker: Philipp Mertsch, RWTH Aachen University
- Abstract: The Galaxy is pervaded by a flux of high-energy, non-thermal particles: cosmic rays. The last years have seen great progress towards elucidating the century-old questions of cosmic ray origin. Yet, a number of anomalies point to more complex dynamics than previously thought. With new and upcoming data, we are in a position to put some stress on the standard picture of cosmic rays and address some of the fundamental questions: What is the energy of transition from Galactic to extra-Galactic sources? How is magnetised turbulence shaping the spectra and anisotropies of cosmic rays? And what is the feedback of cosmic rays on their environments? In this talk, I will describe some of our recent works in that direction. Diffuse emission in high-energy gamma-rays and neutrinos, as measured by experiments like IceCube at the South Pole, is a great tool for studying cosmic rays elsewhere in the Galaxy. We have recently provided new predictions for gamma-rays and neutrinos, including properly evaluated model uncertainties. I will address the need for better gas maps and explain how we used Bayesian inference in producing the highest resolution 3D maps of atomic and molecular hydrogen in the Galaxy to date.
- Host: Paolo Desiati
- Astronomy Colloquium
- Our Chemical Origins: Tracing the History of Cold and Hot Gas During Planet Formation
- Time: 3:30 pm - 4:30 pm
- Place: 4421 Sterling Hall
- Speaker: Abygail Waggoner, UW-Madison
- Abstract: The gas and dust of protoplanetary disks are a window into the history of the Solar System and extrasolar planetary systems, but there are still many aspects of the chemistry in these planet forming regions that are not well understood. This talk will be divided into two questions that, when combined, will provide a clearer picture of the gasses available to forming planets. These questions are: 1) How does the central star (and X-ray flaring events in particular) impact the cold gas? 2) How does the hot gas close to the star evolve over time? To answer these questions, I will present a combination of results and future projects using chemical-disk models and observations from ALMA, SMA, and JWST observing facilities.
- Host: Melinda Soares-Furtado