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UID:Baylor_CMS_Event-82595
DTSTAMP:20260610T125855Z
SUMMARY:Casper presents: Dr. Lorin Matthews, Cosmic Dust Aggregation with Stochastic Charging
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:The coagulation of cosmic dust grainsis a fundamental process which takes place in many=0D=0A=
astrophysical environments, such as presolar nebulae, circumstellar and protoplanetary=0D=0A=
disks, and cometary tails. Cosmic dust grains can become charged through the interaction=0D=0A=
with their plasma environment and other processes, and the subsequent electrostatic force=0D=0A=
between dust grains can strongly affect the coagulation rate. The electrical charge of a dust=0D=0A=
grain experiences stochastic fluctuations since ions and electrons are collected on the surface=0D=0A=
of the dust grain at random time intervals. In this study, first, a set of Langevin equations=0D=0A=
is developed to model these fluctuations while respecting that the grain surface patches,=0D=0A=
utilized in the numerical solution, separately collect charges. Then, employing the Langevin=0D=0A=
equations, the influence of the fluctuations on the coagulation process and the physical=0D=0A=
characteristics of the formed aggregates are examined. It is shown that dust with small=0D=0A=
charges (due to the small size of the dust or a tenuous plasma environment) are affected=0D=0A=
most strongly.
LOCATION:Baylor Sciences Building, Room E.231
DTSTART;TZID=US_Central:20130215T133000
DTEND;TZID=US_Central:20130215T150000
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