This note gives a comparison on the three quantum pictures. Also, the Dyson series are introduced with the help of time-ordering operators.

# Category: Quantum Mechanics

## Blackbody Radiation

1. What is Blackbody Radiation? All normal matter emits electromagnetic radiation when it has a temperature above absolute zero. The radiation represents a conversion of a body’s thermal energy into electromagnetic energy, and is therefore called thermal radiation. It is a spontaneous process of radiative distribution of entropy.

## Boltzmann Transport Equation

Before Maxwell and Gibbs introduced ensemble theory, physicists such as Bernoulli, Herapath, Joule, Kronig, Clausius, Boltzmann and so on has constructed the kinetic theory which is the beginnings of statistical mechanics. Kinetic theory starts with the microscopic movements of all of the particles, try to find out the distribution of these particles in space. Based […]

## Quantum Mechanics: Time-Dependent Perturbation Theory

1. Statement of the Problem The Hamiltonian we are considering is (1) and we have already known the eigenkets and eigenvalues of (2) What we are interested is that, If we are given an initial state (3) what will it change with time? The Schrodinger Equation is (4) Because the Hamiltonian […]