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SUMMARY:Non-linear oscillations of hydrodynamic tori: One ring to rule the
 m all... - Callum Fairbairn - DAMTP\, Cambridge
DTSTART:20201126T130000Z
DTEND:20201126T140000Z
UID:TALK153766@talks.cam.ac.uk
CONTACT:Cleo Loi
DESCRIPTION:Oscillations are invoked to explain a range of astrophysical p
 henomena and discs are no exception. High frequency Quasi-Periodic Oscilla
 tions (QPOs) around compact objects are often modelled as oscillations of 
 thick tori. However\, the non-linear regime which is most relevant to obse
 rvations\, is still not well understood. Tilting modes in such rings\, whi
 ch break the symmetry about the mid-plane\, may also match onto and extend
  our understanding of warped discs in the limit of thin tori. \n\nTo this 
 end I have developed a novel ‘ring model’ which acts as a framework to
  investigate both slender tori and extended warps. Through a combination o
 f semi-analytical methods I will talk about the discovery of highly non-li
 near resonant solutions\, which couple extreme breathing modes to the tilt
 . These represent precessing warped structures in the previously untreated
  inviscid\, Keplerian regime.
LOCATION:Online
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