### Surface equivalent to bulk

Sep. 11th, 2017 02:25 amMaldacena discovered that the boundary and the bulk are completely equivalent.... the relatively simple, gravity-free equations that prevail on the boundary contain the same information and describe the same physics as the more complex equations that rule the bulk.

“It’s kind of a miraculous thing,” says Van Raamsdonk. Suddenly, he says, Maldacena’s duality gave physicists a way to think about quantum gravity in the bulk without thinking about gravity at all: they just had to look at the equivalent quantum state on the boundary.

http://www.nature.com/news/the-quantum-source-of-space-time-1.18797

== link thanks to lxe

As a side note, I never thought about the equivalence of information and energy wrt entropy. There's a vague analogy here with Hayek's idea that prices convey information. Moreover, we can think about Arrow's technical change hypothesis as two stage process: productive absorption of information (learning curve) and productive absorption of capital (cumulative investment).