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DTSTART:20070311T020000
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DTSTAMP:20260114T211002
DTSTART;TZID=America/Detroit:20260227T150000
DTEND;TZID=America/Detroit:20260227T160000
SUMMARY:Lecture / Discussion:AIM Seminar:  Optimal scalar and vector transport using branching flows
DESCRIPTION:Abstract:  We are interested in the design of forcing in the Navier–Stokes equation such that the resultant flow maximizes the heat transfer between two differentially heated walls for a given power supply budget. Previous work established that heat transport cannot scale faster than 1/3-power of the power supply. We present a novel construction of three dimensional \"branching pipe flows\" for which we show the sharpness of the upper bound. After carefully examining these designs\, we extract the underlying physical mechanism that makes the branching flows \"efficient\,\" based on which we present a design of mechanical apparatus that\, in principle\, can achieve the best possible case scenario of heat transfer. In the latter part of the talk\, we extend this approach to transport of a divergence-free vector. We present branching flow designs that achieve a momentum transport scaling (in Reynolds number) that aligns precisely with that of turbulent flow in a channel.\n\nContact:  Ian Tobasco
UID:141899-21889614@events.umich.edu
URL:https://events.umich.edu/event/141899
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 1084
CONTACT:
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DTSTAMP:20260220T124737
DTSTART;TZID=America/Detroit:20260227T150000
DTEND;TZID=America/Detroit:20260227T160000
SUMMARY:Lecture / Discussion:HET Seminar | The String Landscape\, precisely
DESCRIPTION:Compactifications of higher dimensional string theories offer perhaps the most promising ``top-down’’ path toward realistic models of our universe. In the way stands the notorious difficulty of computing the 4d effective action beyond tree level\, and a lack of concrete embeddings of Standard Model-like physics with a sufficiently long lived vacuum. In this talk\, after reviewing the current status of such compactifications (the “string landscape”)\, I will present recent and ongoing works aimed at these problems. Concretely\, I will discuss work on string dualities that can be used as a tool to evaluate certain quantum corrections in flux compactifications\, as well as upcoming work featuring new ensembles of top-down Standard Model constructions using type IIB string theory. Finally\, I’ll report on progress in evaluating the classical superpotential in type IIB compactifications on Calabi-Yau orientifolds.\n\nBased on works with Federico Compagnin\, Jim Halverson\, Björn Hassfeld\, and Elijah Sheridan
UID:145154-21896740@events.umich.edu
URL:https://events.umich.edu/event/145154
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Talk,Seminar,Science,Physics,High Energy Theory Seminar
LOCATION:West Hall - 340
CONTACT:
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