The holographic principle suggests that gravity eliminates the distinction between volume and surface area. This concept implies that the contents of any spatial region can be reconstructed by measuring parameters on its boundary, effectively treating the interior volume as redundant information.
The AdS/CFT correspondence, established in the late 1990s, mathematically links gravity and quantum mechanics. It demonstrates that an interior volume with gravity is equivalent to a surface governed by conformal field theory, where gravity is absent. These foundational papers are among the most cited in theoretical physics.
The principle originated from 1970s research by Jacob Bekenstein and Stephen Hawking on black hole entropy, which grows proportionally to surface area rather than volume. Leonard Susskind, Gerard 't Hooft, and Charles Thorn later expanded this into the idea that black holes act as holograms.
While the AdS/CFT model is mathematically rigorous, its application to our universe remains debated. Critics like Latham Boyle argue that entropy related to surface area may stem from entanglement rather than a holographic projection, noting that our universe's de Sitter space lacks the boundary required for this theory.
