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SUMMARY:Non-linear spiral waves in accretion discs - Joshua Brown (DAMTP C
 ambridge)
DTSTART:20251204T123000Z
DTEND:20251204T133000Z
UID:TALK240514@talks.cam.ac.uk
CONTACT:Mika Kontiainen
DESCRIPTION:Spiral density waves occur across the spectrum of astrophysica
 l discs\, and have been studied from many different perspectives over the 
 last 70 years. They’re excited by anything and everything: internal and 
 external companions or perturbers\, instabilities\, vortices\, disc-self-s
 hadowing\, etc.\, and can play important roles in the formation of gaps an
 d rings\, planet migration\, accretion\, and turbulence regulation and fee
 dback.\n\nI’ll introduce a couple of perspectives which have been partic
 ularly insightful historically\, before outlining a global fully non-linea
 r theory of these waves which Gordon Ogilvie and I developed recently\, in
 cluding how and when to use it\, how it relates to prior work\, and some i
 mmediate insights gained. I’ll focus on the problem of planet-disc inter
 action\, comparing the theory to simulations of low-mass and very high-mas
 s disc-embedded planets.
LOCATION:Institute of Astronomy 
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