# Target of my research

## Dynamics of rod in an isotropic phase

One may think that the dynamics and rheology of rod fluids with an isotropic phase in an equilibrium state are well understood.
But, I think that there is room for significant research.
I will publish a paper soon.

## Dynamics of a particle in an ideal gas

I'm interested in the dynamics of a tagged particle in a simple system.
In a previous paper [APS], I investigated the tracer motion in a fluid composed of the point masses.
Of course, the static structure and thermodynamics are the same with an ideal gas.
One may think the tracer motion in such a system should be simple, but it shows complex behaviour in particular parameter regions.
Namely, the tracer velocity is negatively correlated, the mean square displacement shows the plateau region, and non-Gaussian motion occurs.
We clarified that the non-intuitive motion is caused by the correlated collisions with the same gas particle many times (This might be called a ring collision or repeated collision).
The significance of this work is that the dynamic correlation can occur even in a rather simple system.
The tracer motion can not be described by the Langevin equation due to the non-Gaussianity. A simple kinetic theory such as Enskog theory does not work because the effects of complex correlated collisions should be considered.
I want to construct the formalism to describe the tracer motion in such a simple media.

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