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SUMMARY:Revisiting relaxation in globular clusters  - Chris Hamilton (DAMT
 P)
DTSTART:20180529T120000Z
DTEND:20180529T130000Z
UID:TALK104236@talks.cam.ac.uk
CONTACT:Dr. Yufeng Lin
DESCRIPTION:The classical (Spitzer-Chandrasekhar) theory of cluster relaxa
 tion is unsatisfactory because it involves the Coulomb logarithm and compl
 etely neglects the cluster's self-gravity. A modern alternative is the Bal
 escu-Lenard (BL) equation\, which has no such ill-defined parameter and in
 cludes self-gravity.  The BL equation has recently explained the secular e
 volution of collisionless stellar discs.  In this talk I will review the c
 lassical theory and demonstrate its pitfalls\, showing at each stage why t
 he BL equation does a better job.  I will then present the first applicati
 on of the BL formalism to spherical systems.  I will show how the BL flux 
 through action space differs from the corresponding classical flux\, and d
 iscuss what a complete theory of cluster relaxation might entail.\n\nBased
  on Hamilton et al. (2018) https://arxiv.org/abs/1803.11091.\n
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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