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This Week at Physics

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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
Abstract:
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
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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
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