Theoretical Properties of Entropy in a Strong Coupling Region

Understand

Entropy is a quantity for counting physical degrees of freedom in a system.

• At a finite temperature, one can use thermal entropy to study thermodynamical properties.
• At zero temperature, entanglement entropy is expected to provide a suitable order parameter of a phase structure.
• Especially, the entanglement entropy exhibits an interesting codimension two area law in a strongly coupled conformal field theory.