This Week at Physics

 
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This Week at Physics

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Events During the Week of October 7th through October 14th, 2018

Monday, October 8th, 2018

Plasma Physics (Physics/ECE/NE 922) Seminar
Exploring turbulence saturation in 3D plasmas
Time: 12:05 pm
Place: 2241 Chamberlin Hall
Speaker: Dr. Benjamin Faber, Department of Engineering Physics, University of Wisconsin-Madison
Abstract: Minimizing energy and particle losses due to microturbulence remains a significant challenge facing magnetic confinement fusion energy. In this talk, I will examine the physics of turbulence saturation in three-dimensional stellarator plasmas, highlighting recent theoretical and computational achievements. In particular, I will focus on turbulent saturation induced by nonlinear three-wave energy transfer between stable modes at the same scales as the driving instability, and show the three-wave coupling mechanism is dependent on local geometry. These insights into geometric dependence of saturation provides valuable input for future stellarator optimization schemes focused on reducing turbulent transport.
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Unlocking the Higgs portal with exotic Higgs decays
Time: 12:30 pm
Place: 5310 Chamberlin Hall
Speaker: Verena Martinez, UMASS Amherst
Abstract: Following the discovery of the Higgs boson at the Large Hadron Collider (LHC), a major goal is to characterize the properties of this new particle. The Higgs itself is a potential portal to new physics, providing connections between the Standard Model of particle physics and new phenomena, such as signatures of dark matter. Searches for new decays of the Higgs boson will be described using data collected by the ATLAS experiment and future prospects will be discussed.
Host: Kevin Black
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Tuesday, October 9th, 2018

Chaos & Complex Systems Seminar
Observations concerning forensic and clinical encounters involving children with autism spectrum disorder
Time: 12:05 pm
Place: 4274 Chamberlin (refreshments will be served)
Speaker: Doug Maynard, UW Department of Sociology
Abstract: Perceivedly inappropriate social behavior is a central feature of Autism Spectrum Disorder, in that individuals with ASD frequently may violate or breach commonsense norms and expectations. These violations may meet with polite indifference, informal prohibitions, or corrections. Using two forensic cases (police encounters with ASD individuals) and one clinical encounter, I will explore more formal sanctioning and how this can involve something we call “transpositioning.” Under the auspices of official protocols, transpositioning refers to how an official may turn a child’s responsive move into an initiating move, justifying consequential indifference at best or sometimes severe intervention at worst. However, by situating violations in their interactional contexts, we can see how actions usually attributed to the child and his psychological functioning alone are concertedly produced. In group discussion, I hope to have us consider how we can have better understandings of ASD-associated conduct in home, school, and public environments.
Host: Clint Sprott
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Council Meeting
council meetings
Time: 3:30 pm
Place: 2314 Chamberlin Hall
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Wednesday, October 10th, 2018

Department Meeting
Department Meeting
Time: 12:15 pm
Place: 5310 Chamberlin Hall
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Thursday, October 11th, 2018

R. G. Herb Condensed Matter Seminar
Epitaxial Growth of Isotopically Enhanced SiGe Quantum Dots
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Dr. Lisa Edge, HRL
Abstract: This presentation will cover the epitaxial growth and materials characterization of isotopically enhanced SiGe quantum dots by chemical vapor deposition (CVD) and molecular beam epitaxy (MBE). Materials characterization of these advanced SiGe quantum dot structures by AFM, APT, HRTEM, XRR, and XRD will be discussed.
Host: Friesen
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Cosmology Journal Club
Time: 12:00 pm
Place: 5242 Chamberlin Hall
Abstract: Please visit the following link for more details:
http://cmb.physics.wisc.edu/journal/index.html
Feel free to bring your lunch!
If you have questions or comments about this journal club, would like to propose a topic or volunteer to introduce a paper, please email Ross Cawthon (cawthon@wisc.edu) and Santanu Das (sdas33@wisc.edu).
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Atomic Physics Seminar
Direct laser cooling and trapping of diatomic molecules
Time: 2:00 pm
Place: 5310 Chamberlin Hall
Speaker: Prof. David DeMIlle, Yale University
Abstract: The rich internal structures of diatomic molecules enable a wide range of experiments in regimes not accessible with atoms. Uses of molecules range from measurement of symmetry-violating effects that probe interesting phenomena in nuclear and particle physics, to the study of highly correlated quantum systems, to the control of novel phenomena in chemical reactions. Despite this broad interest, methods for cooling and trapping molecules have been far less advanced than those for atoms. In particular, direct laser cooling of molecules was long considered infeasible: the same complex internal structure that makes molecules useful also makes laser cooling more difficult. Over the past several years, our group and others have found methods to overcome this obstacle. Now, most of the standard tools of atomic laser cooling and trapping have been demonstrated to work, with appropriate modifications and for certain molecules. In this talk I will review progress in laser cooling and trapping of molecules, and give an outlook for future directions enabled by these rapidly-developing methods.
Host: Saffman
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Friday, October 12th, 2018

P.U.M.P.: Prospective Undergrads Majoring in Physics
Time: 1:30 pm
Place: 2241 Chamberlin
Abstract: Interested in the Physics Major? Come to P.U.M.P.: Prospective Undergrads Majoring in Physics! Topics include: why you should major in physics, what you can do with a physics degree, major requirements, undergraduate research opportunities, and tutoring opportunities.
Host: Mark Rzchowski
Presentation: poster2018.pdf
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Theory Seminar (High Energy/Cosmology)
Spontaneous symmetry breaking in open systems
Time: 2:00 pm
Place: 5280 Chamberlin Hall
Speaker: Suro Kim, Kobe University
Abstract: Spontaneous symmetry breaking and the Nambu-Goldstone bosons play an important role in various areas of physics. While the Nambu-Goldstone theorem for relativistic systems was established in 1960’s, it is only recently that its generalization to non-relativistic systems has been systematically studied. For example, it has been clarified that fruitful dispersion relations appear depending on the broken symmetry algebra. In this talk, I will discuss recent progress on spontaneous symmetry breaking in nonrelativistic system and dissipative open systems.
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Physics Department Colloquium
A tabletop-scale probe for TeV physics: the electric dipole moment of the electron
Time: 3:30 pm
Place: 2241 Chamberlin Hall
Speaker: David DeMille, Yale
Abstract: Time-reversal (T) symmetry is observed to be broken in K- and B-meson systems, in a manner consistent with the Standard Model (SM) of electroweak interactions. Violation of T-invariance makes it possible for elementary particles such as the electron to have an electric dipole moment (EDM) along their spin axis. Although the SM prediction for the electron EDM is too small to detect, extensions to the SM frequently predict EDMs within a few orders of magnitude of the current limits. I will describe our ACME experiment, which uses methods of atomic and molecular physics to detect the electron’s EDM. We recently completed the most sensitive search for this quantity, finding a result consistent with zero but setting a limit an order of magnitude smaller than previous work. Remarkably, the result of this tabletop-scale experiment sets strong constraints on the existence of T-violating phenomena well above the TeV scale being probed at the Large Hadron Collider, and has a substantial impact on theories of physics beyond the Standard Model.
Host: Mark Saffman
Video: https://vod.physics.wisc.edu/media/2018_10_12.m4v
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