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This Week at Physics

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Events on Tuesday, September 13th, 2016

Chaos & Complex Systems Seminar
Correspondence between intonation and expression in music
Time: 12:05 pm
Place: 4274 Chamberlin Hall (refreshments will be served)
Speaker: Trevor Stephenson, Madison Bach Musicians
Abstract: For demonstration in the lecture I will bring my 17th-century Italian harpsichord and tuning lever (this harpsichord weighs only 40 pounds and has a lovely, clear sound). I will explain and demonstrate how various temperament systems are created (with a wee-bit of the math behind them) and show how different temperaments affect the expressive possibilities of a piece.
Host: Clint Sprott
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Theory Seminar (High Energy/Cosmology)
Baryogenesis from Decaying Magnetic Helicity
Time: 3:30 pm
Place: 5280 Chamberlin
Speaker: Andrew Long, University of Chicago, Kavli Institute for Cosmological Physics (KICP)
Abstract: Due to quantum anomalies in the Standard Model, baryon number is violated in the early universe in the presence of a helical (hyper)magnetic field. I will discuss how the matter / anti-matter asymmetry of the universe may have been created from the decaying helicity of a primordial (hyper)magnetic field. This scenario has the interesting feature that baryogenesis occurs without the violation of (B-L), since the (B+L) asymmetry generated by the hypermagnetic field counteracts the washout by electroweak sphalerons. After the electroweak crossover, the hypermagnetic field becomes an electromagnetic field. Thus, observations of the relic, intergalactic magnetic field today may inform our understanding of the cosmological excess of matter over anti-matter.
Host: Joshua Berger
Presentation: ALong--UW_Seminar.pdf
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