Colloquium


Dear all, 
It is a pleasure for me to announce that the speaker of the  next colloquium  is  Dr Hossein Abbasi of Amir Kabir Univ. More information can be found in the textbox to the right.


Everybody is welcome to attend.


With kind regards,
Y. Farzan

Speaker

Dr Hossein  Abbasi

Affliation

Amir Kabir Univ

Title of talk

Influence of external white noise on the formation of non-Maxwellian velocity distribution function: A molecular dynamics study.

Date and time

Wednesday, 30th of Farvardin (19th of April), 4:30 pm

Place

Farmanieh builing, lecture room C

IPM

Abstract


Dynamics of a dust layer suspending in a plasma and interacting through a Yukawa-type potential is considered. In the small affinity limit, the influence of an external white noise on the formation of Tsallis' velocity distribution function is studied through molecular dynamics simulation. The characteristic length of the noise is much smaller than the system size that causes a number of subsystems (islands) to be formed with the size similar to the noise one. The external noise leads to the temperature fluctuation in each island. Therefore, a stochastic formalism based on a Langevin equation for the fluctuating temperature is presented. The approach provides a dynamical reason how a fluctuating temperature takes a system to a unique class of quasi-equilibrium states. In particular, the dependence of the model systems on the noise parameters is explained. The non-extensive parameter is obtained through which the small affinity limit can be defined.