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SUMMARY:Kinetic equilibria in collisionless magnetized accretion disk plas
 mas - Claudio Cremaschini (SISSA\, Trieste)
DTSTART:20111031T160000Z
DTEND:20111031T170000Z
UID:TALK32963@talks.cam.ac.uk
CONTACT:Henrik Latter
DESCRIPTION:A fundamental problem in theoretical astrophysics concerns the
 \nphenomenology of plasmas arising in the vicinities of compact objects.\n
 In this talk the case of magnetized accretion disk plasmas is\nconsidered.
  The issue is addressed in the framework of kinetic theory.\nIn particular
 \, a theoretical treatment is presented of Vlasov-Maxwell\nequilibria for 
 cases where a collisionless plasma is acted on by\ngravitational and elect
 romagnetic fields. It is pointed out that there\nexist asymptotic kinetic 
 equilibria represented by generalized\nbi-Maxwellian distribution function
 s and characterized by temperature\nanisotropy and primarily toroidal diff
 erential rotation. An exact\nanalytical solution of the stationary Vlasov 
 equation is obtained\,\nbased on the conservation laws of single-particle 
 dynamics. It is\nshown that kinetic equilibria of this type are able to su
 stain both\ntoroidal and poloidal electric current densities\, the latter 
 being\nproduced by temperature anisotropy via finite Larmor-radius effects
 .\nThis leads to the existence of an equilibrium kinetic dynamo effect\nre
 sulting in the self-generation of both poloidal and toroidal\nmagnetic fie
 lds. Remarkably\, the toroidal component arises even\nwithout any net radi
 al accretion or turbulent flows. Conditions for\nthe occurrence of these e
 quilibria are discussed. The theory developed\nallows the analytical const
 ruction of asymptotic stationary solutions\nof the MHD fluid equations
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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