Colloquium: March 12, 2014
Jan Wehr*
What is the Equation of Motion of a Brownian Particle?
Day | Time | Place |
---|---|---|
March 12, 2014 Wednesday | 15:40 | EE01 |
Host: Giovanni Volpe
ABSTRACT — I will outline an experiment, studying movement of colloidal particles in water. Starting from the Newton’s law, I will build a differential equation describing the Brownian motion of such a particle. This equation contains a noise term, accounting for the collisions of the particle with the water molecules. Its careful analysis when the particle’s mass is small, reveals a presence of an unexpected noise-induced drift, in an excellent agreement with the experiment. I will comment on related effects, occuring in a wide class of systems, including equations describing a recent noisy electrical circuit experiment. The talk will assume only familiarity with elementary physics and calculus.
*Arizona University, Arizona, USA
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