|2019 Fall Graduate Colloquium Series|
Robert Verrill, OP
How Quantum Mechanics can consistently describe the use of itself
In this presentation, I will discuss Lazarovici and Huberts response to a no-go theorem of Frauchiger and Renner that says that any single-world interpretation of quantum mechanics leads to inconsistent predictions if it is applicable on all scales. Frauchiger and Renner draw their conclusion from the consideration of an extended Wigners friend thought experiment. Lazarovici and Hubert show that the fallacy of Frauchiger and Renner’s argument is based on an inconsistent application of the collapse rule. They go on to argue that the proper conclusion one should draw from the extended Wigners friend thought experiment is that there is a tension between quantum non-locality and Lorentz invariance. However, I will suggest that we may not need to draw this conclusion if we consider Kents Lorentz-invariant one-world interpretation of quantum theory. In other words, we can hope for a single-world interpretation of quantum mechanics that leads to consistent predictions on all scales without having to sacrifice Lorentz invariance.
Dustin Lazarovici & Mario Hubert, Scientific Reports 470 (9):1-8 (2019)
Investigation of the Effect of Substitution on the Magnetostrictive Performance of Fe-Ga Alloys
Magnetostrictive materials are routinely employed as actuator and sensor elements in a wide variety of noise and vibration control systems. Due to the high drive towards improved efficiencies in vibration systems, there is a search for materials with high magnetostriction at low fields. FeGa alloys (Galfenol) exhibits a medium magnetostriction with and the advantage of a magnetically soft material, low saturation magnetic field (~200 Oe) and low cost. Wang and Wu report the results of the effect of introducing small amounts of additional X (e.g., X = Ag or Cu) on Galfenol and find that it may double the magnetostriction with a substitutional percentage of only 1.6%. These results may be helpful to further optimize the magnetostrictive properties of Fe-Ga alloys for device applications.
For more information contact: Dr. Kenneth Park, 254-710-2282