Holographic Principle

Bulk 3D ↔ Boundary 2D · AdS/CFT

Entropy S = 0
Area A = 0
S/A = 0.25 × 1/4G
Mode: ADS/CFT
S = A/4G (Bekenstein-Hawking)
AdS₅ × S⁵ ↔ N=4 SYM
Z_bulk[φ₀] = ⟨exp∫φ₀O⟩_CFT