Events at Physics
Events on Thursday, September 15th, 2016
- R. G. Herb Condensed Matter Seminar
- Quantum annealing--advantages and pitfalls
- Time: 10:00 am
- Place: 5310 Chamberlin
- Speaker: Hari Krovi, BBN Technologies
We will review the framework of quantum annealing and quantum adiabatic algorithms. We will describe the evidence that they give speed-ups over classical algorithms for optimization problems and the need for non-stoquasticity in the Hamiltonian. We also present some negative results showing evidence that they do not give an exponential speed-up over classical algorithms for these problems. Finally, we present some recent work on constructing annealing algorithms with non-stoquastic terms.
- Host: Vavilov
- Astronomy Colloquium
- Cosmic Rays in Galaxies - Drivers of Winds?
- Time: 3:30 pm
- Place: 4421 Sterling Hall, Coffee and cookies 3:30 pm, Talk starts 3:45 PM
- Speaker: Joshua Wiener, UW Madison Astronomy Dept
- Abstract: Cosmic rays are often cited as an appealing driver of galactic winds. Cosmic rays(CRs) have some advantages as a wind-driving mechanism, such as long cooling times which allow the CRs to keep their energy for long periods of time. In this talk I will summarize the physics of CR transport, and how CRs interact with the ambient gas in a galaxy. I present numerical simulations of isolated galaxies, which reveal how the characteristics galactic winds depend strongly on how the CR physics are modeled.
- Host: Astronomy Dept