Event description
Based on arXiv:2602.09195, we investigate integrable open spin chains in the context of holography, focusing on the scattering of excitations off a boundary carrying an internal degree of freedom. By imposing the preservation of the SU(1|2) boundary symmetry, we construct the most general reflection matrix compatible with integrability. Since symmetry constraints do not fully determine its structure, we further exploit boundary Yangian symmetry, as the underlying algebraic structure, to derive a continuous family of integrable reflection matrices.
A concrete realization of this framework arises in the study of operator insertions along the half-BPS Wilson loop in ABJM theory, which is holographically dual to type IIA string theory on AdS4 x CP3, or to M-theory in an appropriate limit. In this setting, the boundary degree of freedom can be interpreted as a boundary bound state, emerging from pole structures in the dressing phase of the reflection matrix. We further analyze these states using the boundary bootstrap approach and find agreement with our construction. Finally, the ABJM realization allows for non-trivial perturbative checks of our proposal.
The ultimate goal is to compute the Lüscher-type finite-size corrections to the energy spectrum, which are essential for determining the anomalous dimensions of short-chain operators, such as those appearing in deformations of Wilson loops in the ABJM model.
Our results, exploiting integrable structures in superconformal field theories, contribute to the broader program of understanding deformations and RG flows on line-defects in the AdS/CFT context.