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Brunner, Ilka and Schmidt-Colinet, Cornelius (2016): Reflection and transmission of conformal perturbation defects. In: Journal of Physics A-Mathematical and theoretical, Vol. 49, No. 19, 195401

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We consider reflection and transmission of interfaces which implement renormalisation group flows between conformal fixed points in two-dimensions. Such an RG interface is constructed from the identity defect in the ultraviolet CFT by perturbing the theory on one side of the defect line. We compute reflection and transmission coefficients in perturbation theory to third order in the coupling constant and check our calculations against exact constructions of RG interfaces between coset models.

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