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Oct 26, 2021

Oct 26, 2021

1:30 PM - 2:20 PM

Virtual Event

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The free group factor problem and Popa's MV-property. Professor Sayan Das; University of Iowa Abstract: One of the most important outstanding problems in von Neumann algebras asks if the group von Neumann algebra of the free group on two generators, denoted by L(F2), is isomorphic to the group von Neumann algebra of the free group on infinitely many generators, denoted by L(F8). Recently, S. Popa established a roadmap for showing the nonisomorphism of L(F2) and L(F8). The first step of the...

Oct 26, 2021

2:30 PM - 3:20 PM

Virtual Event

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Reflection positivity, duality, spectral theory, and applications. Relativistic quantum fields vs Euclidean fields Professor Palle Jorgensen Abstract We consider reflection-positivity (Osterwalder-Schrader positivity, OS-p.)  as it is used in the study of renormalization questions in physics. This refers to specific Hilbert spaces that arise before and after reflection. Our focus is a comparative study of the associated spectral theory, now referring to the canonical operators in these two...

Oct 26, 2021

3:30 PM - 4:30 PM

Virtual Event

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A review of the stellarator concept: from Spitzer to W7-X Dr. Elizabeth J. Paul; Department of Astrophysical Sciences, Princeton University 26 OCT 2021: Physics and Astronomy Colloquium 3:30pm, Online via Zoom Zoom Link: https://uiowa.zoom.us/j/94392147007 Meeting ID: 943 9214 7007, No passcode A stellarator confines plasma using non-axisymmetric magnetic fields for fusion energy sciences as well as the study of non-neutral and pair plasmas. This concept provides a promising route t...

Nov 2, 2021

Nov 2, 2021

1:30 PM - 2:20 PM

Virtual Event

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The free group factor problem and Popa's MV-property. Professor Sayan Das; University of Iowa Abstract: One of the most important outstanding problems in von Neumann algebras asks if the group von Neumann algebra of the free group on two generators, denoted by L(F2), is isomorphic to the group von Neumann algebra of the free group on infinitely many generators, denoted by L(F8). Recently, S. Popa established a roadmap for showing the nonisomorphism of L(F2) and L(F8). The first step of the...

Nov 2, 2021

2:30 PM - 3:20 PM

Virtual Event

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Renormalization and Scattering in Relativistic Particle Theories Professor William H. Klink Abstract: I have long been puzzled as to why the fundamental theory of relativistic quantum mechanics is a field theory and not a particle theory.  In this talk I give several reasons standing in the way of a  relativistic particle theory.   Starting with the irreps of the Poincare group, I then formulate a particle theory in terms of bare creation and annihilation operators rather than field operat...

Nov 9, 2021

Nov 9, 2021

3:30 PM - 4:30 PM

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"Lattice QCD for Neutrino Oscillation Physics" Dr. Aaron Meyer; Brookhaven National Laboratory

Nov 16, 2021

Nov 16, 2021

3:30 PM - 4:30 PM

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"Photonic Devices Based on Semiconductor Quantum Structures" Dr. Igor Vurgaftman; Naval Research Laboratory 

Nov 30, 2021

Nov 30, 2021

3:30 PM - 4:30 PM

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"Title: TBD" Professor Manel Errando; Department of Physics; Washington University, St. Louis