2020 Spring Graduate Colloquium Series: Calvin Carmichael/Robert Verrill

DateFebruary 28, 2020
Time3:35 - 5:00 pm
LocationBaylor Sciences Building, Room E.231
2020 Spring Graduate Colloquium Series

Calvin Carmichael

Using Acoustic Perturbations to Dynamically Tune Shear Thickening in Colloidal Suspensions

Colloidal suspensions are commonly used in industrial settings. When force is applied to suspensions, the suspensions can thicken drastically, attributed to the formation of force chains. This Paper examines using piezoelectric transducers orthogonal to the flow of the suspensions in order to de-thicken them via acoustic perturbations. The acoustic perturbations break the force chains in such a way that is generally applicable to most settings, making machinery less likely to breaking down during mixing procedures.

By: Prateek Sehgal , Meera Ramaswamy, Itai Cohen, and Brian J. Kirby

Robert Verrill

Peaceful Coexistence: Examining Kents Relativistic Solution to the Quantum Measurement Problem

In this presentation, I will discuss Butterfields paper on Kents one-world relativistic solution to the quantum measurement problem. Butterfield begins by explaining what a relativistic solution to the quantum measurement problem should look like, namely, it should explain precisely what measurement means and why the apparent violation of locality in EPR-type measurements does not undermine Special Relativity. Butterfield argues that the common Outcome Dependence/Parameter Independence explanation of peaceful coexistence between Special Relativity and quantum theory is far from adequate. This concern motivates Butterfields consideration of Kents proposal which Butterfield judges to fair much better. However, Butterfield notes that there are still remaining issues that Kent needs to address if one is to accept his solution. Most notably, since Kents solution involves hidden variables, he needs to address the no-go theorem of Collbeck and Renner et al. who argue that any non-trivial hidden variables extension of quantum theory will either lead to a violation of Parameter Independence (and hence Special Relativity), or to a violation of a somewhat misleadingly called no-conspiracy assumption. Although the jury is still out, Butterfield suggests that Kents proposal may well obey Parameter Independence, so that even though the no-conspiracy assumption would have to be violated, Kent would have succeeded in solving the quantum measurement problem.

Jeremy Butterfield, 2018, Reality and Measurement in Algebraic Quantum Theory, ed Ozawa M, Butterfield J, Halvorson H, Redei M, Kitajima Y and Buscemi Y (Springer) arXiv:1710.07844.

For more information contact: Dr. Kenneth Park, 254-710-2282
PublisherDepartment of Physics
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