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We analyze the defect scaling Lee-Yang model from the perturbed defectconformal field theory (DCFT) point of view. First the defect Lee-Yang model issolved by calculating its structure constants from the sewing relations.Integrable defect perturbations are identified in conformal defect perturbationtheory. Then pure defect flows connecting integrable conformal defects aredescribed. We develop a defect truncated conformal space approach (DTCSA) toanalyze the one parameter family of integrable massive perturbations in finitevolume numerically. Fusing the integrable defect to an integrable boundary therelation between the IR and UV parameters can be derived from the boundaryrelations. We checked these results by comparing the spectrum for large volumesto the scattering theory.

Defect scaling Lee-Yang model from the perturbed DCFT point of view