# Dirac Equation

### The Terms

- Imaginary unit

- Planck's constant divided by **[Value: 1.051 × 10 ^{-34} m^{2} kg s^{-1}]**

- The speed of light **[Value: 3 × 10 ^{8} m s^{-1}]**

- Dirac matrices

- Four-gradient,

- Rest mass of the electron **[Value: 0.511 MeV / c ^{2}]**

- Wavefunction of the system - the probability amplitude for different configurations of the system at different times. Also known as the quantum state, this is the most complete description that can be given to a physical system.

### What Does It Mean?

The Dirac Equation is a relativistic quantum mechanical wave equation which provides a description of spin-1/2 particles, such as electrons, consistent with quantum mechanics and special relativity. This equation predicts the existence of antiparticles and predates their actual experimental discovery.

### Further information at Warwick

The Dirac Equation is covered in our fourth year modules "PX408 Relativistic Quantum Mechanics" and "PX430 Gauge Theories for Particle Physics".

` `