Boundary Conformal Field Theory

Boundary Conformal Field Theory (BCFT) is a branch of theoretical physics that studies how conformal fields—mathematical descriptions of particles and forces—behave when they are confined by boundaries, such as edges or surfaces. It explores how symmetries and physical properties change near these boundaries, which is crucial for understanding phenomena like surface states in materials or string theories with endpoints. BCFT combines the principles of conformal symmetry (scaling and angle-preserving transformations) with boundary conditions to analyze systems where the presence of edges or interfaces significantly influences their behavior, revealing deep insights into both fundamental physics and applications.