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A conformal field theory (CFT) is a quantum field theory that is invariant under conformal transformations. In 2D, the infinite-dimensional algebra of local conformal transformations normally permits exact solution or classification of such theories. Further use for CFT applications to string theory, statistical mechanics, and condensed matter physics.
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Dependence of $c$-function and justification of entropic $c$-theorem
I am reading the paper on the $c$-theorem [1:Zamolodchikov 1986] and the entropic $c$-theorem [2:Casini, Huerta 2006].
Q1. What do you mean by "monotonically decreasing under RG flow"?
I am unclear o …