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RG Flows of Non-Unitary Minimal CFTs

In this paper we study the renormalization group flow of the $(p,q)$ minimal (non-unitary) CFT perturbed by the $Φ_{1,3}$ operator with a positive coupling. In the perturbative region $q>>(q-p)$, we find a new IR fixed point which corresponds to the $(2p-q,p)$ minimal CFT. The perturbing field near the new IR fixed point is identified with the irrelevent $Φ_{3,1}$ operator. We extend this result to show that the non-diagonal ($(A,D)$-type) modular invariant partition function of the $(p,q)$ minimal CFT flows into the $(A,D)$-type partition function of the $(2p-q,p)$ minimal CFT and the diagonal partition function into the diagonal.