### Conveners

#### A17: Statistical and Theoretical Physics

- Surasak Chiangga (Department of Physics, Kasetsart University)
- Papichaya Chaisakul (Kasetsart University and Université Paris-Sud)

Fokker-Planck equations are partial differential equations that describe stochastic processes. Two applications will be discussed: liquid crystal physics and quantum optics. Liquid crystals can show different aggregate phases that can be used in commercial applications. These phases are self-organized equilibrium states and are characterized by order parameters such as the Maier-Saupe order...

There are some limitations of discrete-time Markov processes modeled as approximations to continuous-time Markov processes. In discrete-time simulation models, *time* is discretised into uniform steps and transitions between states are discribed by transition probabilities whereas, in continuous-time Markov processes, state changes are driven by transition rates. In our research, we focus on...

We take an assumption about the time variable in physics that actually the continuous time flow constitutes from in finite tiny discrete time steps resulting in different behavior of the system between these two time scales. To proof the assumption, the two coupled harmonic oscillators is studied as a toy model both in classical and quantum realms. In classical level, the discrete equation of...

The fabrication of uniform island nanostructures on heteroepitaxial thin films is a crucial step toward improving the efficiency of optoelectronic and solar cell devices. In this work, we investigate a strained heteroepitaxial thin film system in two dimensions using the kinetic Monte Carlo simulation method. The strain arising from the lattice mismatch is incorporated into the system using an...

Linear-time invariant (LTI) oscillation systems such as mechanical vibration,

series RLC and parallel RLC circuits under external driving force can be solved by using simplest initial conditions or

employing of Green's function of which knowledge of initial condition

of the driving force term is needed. Here we show a mathematical connection of the LTI system and the Helmholtz...

We find greater genetic diversity in a Penna model when the mutation threshold is less than the reproductive age, for the case of individuals reproducing only once in their lifetime. This greater diversity is obtained at the cost of decreased saturation population. An increased mean lifespan was obtained for the population with greater genetic diversity. We interpret this longer lifespan as a...