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SUMMARY:Perspectives on warped astrophysical discs - Prof. Gordon Ogilvie 
 (DAMTP\, Cambridge)
DTSTART:20200128T130000Z
DTEND:20200128T140000Z
UID:TALK134266@talks.cam.ac.uk
CONTACT:Chris Hamilton
DESCRIPTION:Astrophysical discs tend to become warped whenever there is mi
 salignment between the plane of the disc and that of an inner or outer bin
 ary\, or the spin axis of the central object.  Evidence of misalignments a
 nd warps has increased recently through observations of discs of dusty gas
  around young stars.  The discovery of polar discs in eccentric binaries a
 nd Lidov-Kozai oscillations in fluid discs motivate the study of warped di
 scs for large tilt angles.  In this informal talk I will discuss some rece
 nt investigations and open questions regarding the nonlinear dynamics of w
 arped discs\, with an emphasis on ideal gas dynamics.  Making use of the a
 ffine model in which the disc is represented as a set of fluid columns\, I
  will discuss the importance of apsidal precession and a nonlinear resonan
 ce of the oscillation modes.  I will also mention different types of insta
 bility that can occur in warped discs.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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