CFT

The unions that signed the letter are California Teachers Assn., the largest state teachers union, and CFT, the other major statewide teachers union.

This additional finding is the notion that spacetime on the AdS side emerges from quantum entanglement on the CFT side—not just in black holes but throughout the universe.

Something similar happens in AdS/CFT.

It’s possible because the CFT side of the duality turns out to be weakly coupled, making calculations tractable.

Van Raamsdonk credits the AdS/CFT correspondence for making physicists question the very nature of spacetime.