This post is based on my joint paper with Pierre Germain and Alexandru D. Ionescu. We investigate the local well-posedness theory for the space-homogeneous 4-wave kinetic equation $latex \partial_t f(t,p) = \mathcal{Q}[f](t,p), \mbox{ on } \mathbb{R}_+\times\mathbb{R}^3, (1)$ $latex f(0,p) = f_0(p) \mbox{ on } \mathbb{R}^3. $ The trilinear operator $latex \mathcal{Q}$ is given by $latex … Continue reading Chapter 11: Optimal local well-posedness theory for the kinetic wave equation.

# Category: Wave Turbulence Quantum Kinetics

# Chapter 10: On the wave turbulence theory for stratified flows in the ocean

This post is based on my joint paper with Leslie M. Smith and Irene M. Gamba. After the pioneering work of Garrett and Munk, the statistics of oceanic internal gravity waves has become a central subject of research in oceanography. The time evolution of the spectral energy of internal waves in the ocean can be … Continue reading Chapter 10: On the wave turbulence theory for stratified flows in the ocean

# Chapter 9: Wave turbulence theory for capillary water waves

This post is based on my joint paper with Toan Nguyen. Although many studies have been carried on to understand the Hasselmann-Zakharov weak turbulence equation for capillary waves since its derivation in the 60's, the question about the existence and uniqueness of solutions to the equation still remains unanswered, due to the complexity of the … Continue reading Chapter 9: Wave turbulence theory for capillary water waves

# Chapter 8: Quantum hydrodynamic approximations to finite temperature trapped Bose gases

This post is based on my joint paper with Shi Jin. At temperature $latex T$, bosons of mass $latex m$ can be regarded as quantum-mechanical wavepackets which have an extent on the order of a thermal de Broglie wavelength $latex \lambda_{dB} = \left(\frac{2 \pi \hbar^2}{m k_B T}\right)^\frac12$, where $latex k_B$ is the Boltzmann constant. The … Continue reading Chapter 8: Quantum hydrodynamic approximations to finite temperature trapped Bose gases

# Chapter 7: Coupling kinetic and Schrodinger equations – A simplified model by Soffer and Tran.

This post is based on my joint paper with Avy Soffer. When a bose gas is cooled below the Bose-Einstein critical temperature, the Bose-Einstein condensate is formed, consisting of a macroscopic number of particles, all in the ground state of the system. As we have already known from previous chapters (Chapters 1 &3), a finite … Continue reading Chapter 7: Coupling kinetic and Schrodinger equations – A simplified model by Soffer and Tran.

# Chapter 6: Derivation of quantum kinetic equations

This post is based on my joint work with Linda E. Reichl. Let us recall from the previous chapters that the BEC occupies the lowest quantum state, at that point macroscopic quantum phenomena become apparent. Above the BEC are excited atoms, which occupy higher quantum states. The are two types of interactions: excited atoms - excited atoms: … Continue reading Chapter 6: Derivation of quantum kinetic equations

# Chapter 5: Chemical reaction network and quantum kinetic theories. The key of a successful marriage.

This post is based on my joint work with Gheorghe Craciun. In this chapter, I will try to answer the following conjecture: ''What is the key for the marriage of chemical reaction network and quantum kinetic theories to be successful?'' The behavior of reactor vessels used in chemical engineering are often based on systems of nonlinear ordinary … Continue reading Chapter 5: Chemical reaction network and quantum kinetic theories. The key of a successful marriage.