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SUMMARY:Rays\, multipoles\, and caustics - Professor C. John Chapman\, Kee
 le University
DTSTART:20251112T160000Z
DTEND:20251112T180000Z
UID:TALK235279@talks.cam.ac.uk
CONTACT:Dr Matthew Nethercote
DESCRIPTION:It is shown that the familiar three-dimensional multipole in a
 coustics (`Hankel function times associated Legendre function') has a ray 
 structure of greater interest than might be supposed\, and this structure 
 makes possible a new theory of near-field scattering. The key idea is that
  in constructing ray fields one must include subsonic rays as being just a
 s important as ordinary rays\, even though the governing wave equation con
 tains just a single parameter\, `the speed of sound'.
LOCATION:Centre for Mathematical Sciences MR5\, CMS
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