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SUMMARY:Ben Withers (University of Southampton)
DTSTART:20201117T150000Z
DTEND:20201117T160000Z
DTSTAMP:20260423T023047Z
UID:HoloTube/25
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/HoloTube/25/
 ">Does the hydrodynamic expansion converge?</a>\nby Ben Withers (Universit
 y of Southampton) as part of HoloTube: Applied holography webinars\n\n\nAb
 stract\nThis is one of the foundational questions in relativistic fluid me
 chanics\, and concerns the properties of a gradient expansion at large ord
 ers. Holographic theories provide the ideal testing ground for this questi
 on\, since hundreds of orders in the expansion can be obtained with relati
 ve ease. Famously\, the answer was found to be “No” for the Bjorken fl
 ow\, an expanding plasma considered in position space. In this talk I will
  begin by reviewing earlier work\, in which I show that the answer is inst
 ead “Yes” for QNM dispersion relations in momentum space\, with a radi
 us of convergence set by mode collisions in the complex momentum plane. I 
 will then present recent work showing that these hitherto disjoint avenues
  of research are naturally unified\, and share a common underlying mechani
 sm governing convergence.\n
LOCATION:https://researchseminars.org/talk/HoloTube/25/
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