These questions are linked, so I've asked them in a single post:
Why is a critical one-dimensional many-body system a two-dimensional conformal field theory?- Why the switch from 1D to 2D?
What does 2+1 dimensional mean? Two dimensions of space and one of time? Or is it a strange way of saying three dimensional?
Can a critical many-body system in thermal equilibrium be a 2+1 dimensional system? - Assuming the "+1" is time, considering a Wick's rotation, does the +1 become a measure of temperature?