I read it somewhere in physics SE that quantum field theory is today considered as deformation of conformal field theory. What does that mean?
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$\begingroup$ Without the context, this claim sounds absurd, sorry. $\endgroup$– Prof. LegolasovCommented Mar 11, 2018 at 5:37
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$\begingroup$ The idea might be that by rescaling a QFT you reach a renormalization group fixed point; that fixed point is scale-invariant and therefore in many cases conformally invariant; then can we recover the original QFT by deforming that CFT? This is how I would understand the question, but I do not know the answer. Anyway it is no more absurd to consider QFT as a deformation of CFT, than to consider QFT as a deformation of free QFT. $\endgroup$– Sylvain RibaultCommented Mar 11, 2018 at 19:50
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$\begingroup$ See also this question: physics.stackexchange.com/questions/339309/… $\endgroup$– Sylvain RibaultCommented Mar 12, 2018 at 8:33
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$\begingroup$ See, for example, the introduction to 1602.07982 or 1601.05000 $\endgroup$– Elliot SchneiderCommented Mar 12, 2018 at 15:21
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