Abstract
We provide evidence for the existence of non-trivial unitary conformal boundary conditions for a three-dimensional free scalar field, which can be obtained via a coupling to the m’th unitary diagonal minimal model. For large m we can demonstrate the existence of the fixed point perturbatively, and for smaller values we use the numerical conformal bootstrap to obtain a sharp kink that smoothly matches onto the perturbative predictions. The wider numerical analysis also yields universal bounds for the spectrum of any other boundary condition for the free scalar field. A second kink in these bounds hints at a second class of non-standard boundary conditions, as yet unidentified.
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Behan, C., Di Pietro, L., Lauria, E. et al. Bootstrapping boundary-localized interactions II. Minimal models at the boundary. J. High Energ. Phys. 2022, 146 (2022). https://doi.org/10.1007/JHEP03(2022)146
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DOI: https://doi.org/10.1007/JHEP03(2022)146