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SUMMARY:Nonlinear Dynamics of Distorted Astrophysical Discs: Warps and All
  - Callum Fairbairn (DAMTP)
DTSTART:20230523T120000Z
DTEND:20230523T130000Z
UID:TALK201313@talks.cam.ac.uk
CONTACT:Dr Emily Sandford
DESCRIPTION:The classical perspective of astrophysical discs models them a
 s being flat\, circular and coplanar. However\, a wealth of observational 
 evidence has highlighted the ubiquity of warped geometries in a variety of
  contexts. This has motivated theoretical efforts to explain the origins o
 f such distortions and understand their ensuing dynamical evolution. Despi
 te marked progress\, a complete theory remains elusive\, particularly in t
 he observationally relevant regime of large warp amplitudes wherein nonlin
 ear effects and hydrodynamic instabilities significantly modify the warp e
 volution. \n\n\n\nIn this talk I will take you down this warped and windin
 g path as I introduce a novel analytical ‘ring’ model for understandin
 g the fundamental distorted dynamics. Our simplifying assumptions characte
 rise the activation of extreme compressive motions for the first time\, wh
 ich are an essential feature for sufficiently large warp amplitudes. I wil
 l then turn towards local numerical experiments which reintroduce all hydr
 odynamical degrees of freedom. This will reveal the feedback of small-scal
 e parametric turbulence on the bulk warping motions and highlight the rich
  range of scales intrinsic to the detailed evolution.  
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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