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CATEGORIES:DAMTP Astrophysics Seminars
SUMMARY:Kinetic equilibria in collisionless magnetized acc
retion disk plasmas - Claudio Cremaschini (SISSA\,
Trieste)
DTSTART;TZID=Europe/London:20111031T160000
DTEND;TZID=Europe/London:20111031T170000
UID:TALK32963AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/32963
DESCRIPTION:A fundamental problem in theoretical astrophysics
concerns the\nphenomenology of plasmas arising in
the vicinities of compact objects.\nIn this talk t
he case of magnetized accretion disk plasmas is\nc
onsidered. The issue is addressed in the framework
of kinetic theory.\nIn particular\, a theoretical
treatment is presented of Vlasov-Maxwell\nequilib
ria for cases where a collisionless plasma is acte
d on by\ngravitational and electromagnetic fields.
It is pointed out that there\nexist asymptotic ki
netic equilibria represented by generalized\nbi-Ma
xwellian distribution functions and characterized
by temperature\nanisotropy and primarily toroidal
differential rotation. An exact\nanalytical soluti
on of the stationary Vlasov equation is obtained\,
\nbased on the conservation laws of single-particl
e dynamics. It is\nshown that kinetic equilibria o
f this type are able to sustain both\ntoroidal and
poloidal electric current densities\, the latter
being\nproduced by temperature anisotropy via fini
te Larmor-radius effects.\nThis leads to the exist
ence of an equilibrium kinetic dynamo effect\nresu
lting in the self-generation of both poloidal and
toroidal\nmagnetic fields. Remarkably\, the toroid
al component arises even\nwithout any net radial a
ccretion or turbulent flows. Conditions for\nthe o
ccurrence of these equilibria are discussed. The t
heory developed\nallows the analytical constructio
n of asymptotic stationary solutions\nof the MHD f
luid equations
LOCATION:MR14\, Centre for Mathematical Sciences\, Wilberf
orce Road\, Cambridge
CONTACT:Henrik Latter
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